• [1065] Hotline of Railway

  • 时间限制: 4000 ms 内存限制: 65535 K
  • 问题描述
  • The railway is finished. It opens up a hotline; you can query how many stone are there on a segment of the railway.

    At the very beginning, all units have 0 stones.

    There're 3 operations:

    A n x y: Add n stones per unit from x to y.

    D n x y: Reduce n stones per unit from x to y. If any unit is less then n stones, it will reduce to 0.

    Q x y: The hotline received a query. You should tell the sum of stones from x to y.

    (0 < n < 100, 0 <= x <= y <= 200000)

  • 输入
  • This problem has several cases.
    The first line of each case is an integer N (0 < N < 10000), indicates how many operations.
    Then follows N lines. Each line contains an operation. The rules are above.
  • 输出
  • For each query, print the sum. One answer per line.
  • 样例输入
  • 2
    A 1 1 100
    Q 1 10
    
  • 样例输出
  • 10
    
  • 提示
  • 来源
  • XadillaX
  • 操作

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