| 
          
         | 
        1501 | 
                
              1501
  2505.  tickets
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1502 | 
                
              1502
  2506. calc
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1503 | 
                
              1503
  2507. untitled
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1504 | 
                
              1504
  2508. 简单题
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1505 | 
                
              1505
  2509. 送分题
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1506 | 
                
              1506
  2510. 弱题
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1507 | 
                
              1507
  2511. 信心题
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1508 | 
                
              1508
  2512. Groc
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1509 | 
                
              1509
  2513. 菜园
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1510 | 
                
              1510
  2514. 取石子游戏
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1511 | 
                
              1511
  2515. Room
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1512 | 
                
              1512
  2516. 电梯
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1513 | 
                
              1513
  2517. 矩形覆盖
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1514 | 
                
              1514
  2518. [Shoi2010]滚动的正四面体
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1515 | 
                
              1515
  2519. [Shoi2010]电脑网络
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1516 | 
                
              1516
  2520. [Shoi2010]扫雷机器人
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1517 | 
                
              1517
  2521. [Shoi2010]最小生成树
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1518 | 
                
              1518
  2522. [Shoi2010]团队游戏
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1519 | 
                
              1519
  2523. [Ctsc2001]聪明的学生
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1520 | 
                
              1520
  2524. [Poi1997]Rek 蚂蚁的递归访问
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1521 | 
                
              1521
   [POI2011] DYN-Dynamite
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1522 | 
                
              1522
  2526. [Poi2011]Inspection
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1523 | 
                
              1523
  2527. [Poi2011]Meteors
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1524 | 
                
              1524
  2528. [Poi2011]Periodicity
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1525 | 
                
              1525
  2529. [Poi2011]Sticks
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1526 | 
                
              1526
  2530. [Poi2011]Party
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1527 | 
                
              1527
  2531. Vijos 1478 囧囧的作业
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1528 | 
                
              1528
  2532. [Cerc2010]Costing Spells
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1529 | 
                
              1529
  2533. [Poi2001]Nas Necklaces项链
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1530 | 
                
              1530
  2534. Uva10829L-gap字符串
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1531 | 
                
              1531
  2535. [Noi2010]Plane 航空管制2
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1532 | 
                
              1532
  2536. [Neerc2008]Clock
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1533 | 
                
              1533
  2537. [neerc2007]Language Recognition
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1534 | 
                
              1534
  2538. [Ctsc2000]公路巡逻
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1535 | 
                
              1535
  2539. [Ctsc2000]丘比特的烦恼
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1536 | 
                
              1536
  2540. [Ctsc2000]快乐的蜜月
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1537 | 
                
              1537
  2541. [Ctsc2000]冰原探险
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1538 | 
                
              1538
  2542. [Ctsc2001]终极情报网
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1539 | 
                
              1539
  2543. [Ctsc2001]逻辑电路最优设计
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1540 | 
                
              1540
  2544. [Ctsc2001]排序二叉树
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1541 | 
                
              1541
  2545. [Ctsc2002]丹奇方块
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1542 | 
                
              1542
  2546. [Ctsc2002]购房计划
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1543 | 
                
              1543
  2547. [Ctsc2002]玩具兵
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1544 | 
                
              1544
  2548. [Ctsc2002]灭鼠行动
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1545 | 
                
              1545
  2549. [Ctsc2001]最优据排序二叉树
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1546 | 
                
              1546
  2550. [Ctsc2004]公式编辑器
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1547 | 
                
              1547
  2551. Tablouri Young
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1548 | 
                
              1548
  2552. Zju2253 Fill the Grid
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1549 | 
                
              1549
  2553. [BeiJing2011]禁忌
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1550 | 
                
              1550
  2554. Color
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1551 | 
                
              1551
  2555. SubString
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1552 | 
                
              1552
  2556. Move
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1553 | 
                
              1553
  2557. [Poi2011]Programming Contest
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1554 | 
                
              1554
  2558. [Poi2000]迷宫的墙
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1555 | 
                
              1555
  2559. [Poi1998] AB-words Abs
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1556 | 
                
              1556
  2560. 串珠子
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1557 | 
                
              1557
  2561. 最小生成树
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1558 | 
                
              1558
  2562. 攻占黄金乡
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1559 | 
                
              1559
  2563. 阿狸和桃子的游戏
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1560 | 
                
              1560
  2564. 集合的面积
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1561 | 
                
              1561
  2565.  [国家集训队] 最长双回文串
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1562 | 
                
              1562
  2566. xmastree
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1563 | 
                
              1563
  2567. 篱笆
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1564 | 
                
              1564
  2568. 比特集合
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1565 | 
                
              1565
  2569. 数树
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1566 | 
                
              1566
  2570. [NOI2000]算符破译
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1567 | 
                
              1567
  2571. Getting Rid of the Holidays
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1568 | 
                
              1568
  2572. Zju1017 The Bermuda Triangle
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1569 | 
                
              1569
  2573. Zju1155 Triangle War
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1570 | 
                
              1570
  2574. [Poi1999]Store-Keeper
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1571 | 
                
              1571
  2575. 外公的难题
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1572 | 
                
              1572
  2576. [Jsoi2011]序的计数
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1573 | 
                
              1573
  2577. Naughty fairies
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1574 | 
                
              1574
  2578. pku3985 Knight
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1575 | 
                
              1575
  2579. Fight with function
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1576 | 
                
              1576
  2580. [Usaco2012 Jan]Video Game
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1577 | 
                
              1577
  2581. [Usaco2012 Jan]Cow Run
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1578 | 
                
              1578
  2582. [Usaco2012Jan]Bovine Alliance
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1579 | 
                
              1579
  2583. PKU3127 Lineland's Airport
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1580 | 
                
              1580
  2584. [Wc2012]memory
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1581 | 
                
              1581
  2585.  世纪大战
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1582 | 
                
              1582
  2586. [Cerc2009](False)faces
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1583 | 
                
              1583
  2587. [Ceoi2011]Team
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1584 | 
                
              1584
  2588. Spoj 10628. Count on a tree
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1585 | 
                
              1585
  2589. Spoj 10707  Count on a tree II
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1586 | 
                
              1586
  2590. [Usaco2012 Feb]Cow Coupons
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1587 | 
                
              1587
  2591. [Usaco 2012 Feb]Nearby Cows
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1588 | 
                
              1588
  2592. [Usaco2012 Feb]Symmetry
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1589 | 
                
              1589
  2593. PKU205 Kid
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1590 | 
                
              1590
  2594. [Wc2006]水管局长数据加强版
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1591 | 
                
              1591
  2595. [Wc2008]游览计划
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1592 | 
                
              1592
  2596. [Wc2007]疯狂赛车
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1593 | 
                
              1593
  2597. [Wc2007]剪刀石头布
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1594 | 
                
              1594
  2598. [IOI2011]garden
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1595 | 
                
              1595
  2599. [IOI2011]Race
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1596 | 
                
              1596
  2600. [Ioi2011]ricehub
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1597 | 
                
              1597
  2601. [Jsoi2011]同分异构体计数
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1598 | 
                
              1598
  2602. [Ctsc2010杀菌计划]
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1599 | 
                
              1599
  2603. [Poi2003]Motorways
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1600 | 
                
              1600
  2604. [Poi2003]Mastermind II
         | 
        0 / 0 | 
        (无) |