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  • Star sky

    C. Star sky
    time limit per test
    2 seconds
    memory limit per test
    256 megabytes
    input
    standard input
    output
    standard output

    The Cartesian coordinate system is set in the sky. There you can see n stars, the i-th has coordinates (xi, yi), a maximum brightness c, equal for all stars, and an initial brightness si (0 ≤ si ≤ c).

    Over time the stars twinkle. At moment 0 the i-th star has brightness si. Let at moment t some star has brightness x. Then at moment (t + 1) this star will have brightness x + 1, if x + 1 ≤ c, and 0, otherwise.

    You want to look at the sky q times. In the i-th time you will look at the moment ti and you will see a rectangle with sides parallel to the coordinate axes, the lower left corner has coordinates (x1i, y1i) and the upper right — (x2i, y2i). For each view, you want to know the total brightness of the stars lying in the viewed rectangle.

    A star lies in a rectangle if it lies on its border or lies strictly inside it.

    Input

    The first line contains three integers n, q, c (1 ≤ n, q ≤ 105, 1 ≤ c ≤ 10) — the number of the stars, the number of the views and the maximum brightness of the stars.

    The next n lines contain the stars description. The i-th from these lines contains three integers xi, yi, si (1 ≤ xi, yi ≤ 100, 0 ≤ si ≤ c ≤ 10) — the coordinates of i-th star and its initial brightness.

    The next q lines contain the views description. The i-th from these lines contains five integers ti, x1i, y1i, x2i, y2i (0 ≤ ti ≤ 109, 1 ≤ x1i < x2i ≤ 100, 1 ≤ y1i < y2i ≤ 100) — the moment of the i-th view and the coordinates of the viewed rectangle.

    Output

    For each view print the total brightness of the viewed stars.

    Examples
    Input
    2 3 3
    1 1 1
    3 2 0
    2 1 1 2 2
    0 2 1 4 5
    5 1 1 5 5
    Output
    3
    0
    3
    Input
    3 4 5
    1 1 2
    2 3 0
    3 3 1
    0 1 1 100 100
    1 2 2 4 4
    2 2 1 4 7
    1 50 50 51 51
    Output
    3
    3
    5
    0
    Note

    Let's consider the first example.

    At the first view, you can see only the first star. At moment 2 its brightness is 3, so the answer is 3.

    At the second view, you can see only the second star. At moment 0 its brightness is 0, so the answer is 0.

    At the third view, you can see both stars. At moment 5 brightness of the first is 2, and brightness of the second is 1, so the answer is 3.

    【题意】

    有一片100*100的星空,上面有n颗星星,每个星星有一个亮度,且在0~C范围内周期性变化,现在给出q个查询,每个查询给出时间和一个矩形,求在该时间时矩形内星星的亮度和。

    一开始看起来很难,就没怎么想,然后看懂了题意,就容易多了,dp就可以了。

     tree[i][j][k] = tree[i][j][k] + tree[i - 1][j][k] + tree[i][j - 1][k] - tree[i - 1][j - 1][k];
    表示在坐标为(i,j)星星亮度为k的个数。
    查询直接ans=tree[xx][yy][t] + tree[x - 1][y - 1][t] - tree[x - 1][yy][t] - tree[xx][y - 1][t];
    当然还要考虑经过的时间t.
     1 #include <bits/stdc++.h>
     2 #define N 105
     3 using namespace std;
     4 int tree[N][N][12];
     5 int n, q, c;
     6 
     7 void dp() {
     8     for (int i = 1; i <= 100; i++) {
     9         for (int j = 1; j <= 100; j++) {
    10             for (int k = 0; k <= c; k++) {
    11                 tree[i][j][k] = tree[i][j][k] + tree[i - 1][j][k] + tree[i][j - 1][k] - tree[i - 1][j - 1][k];
    12             }
    13         }
    14     }
    15 }
    16 
    17 int add(int t, int x, int y, int xx, int yy) {
    18     return tree[xx][yy][t] + tree[x - 1][y - 1][t] - tree[x - 1][yy][t] - tree[xx][y - 1][t];
    19 }
    20 
    21 int main() {
    22 
    23     while (scanf("%d%d%d", &n, &q, &c)!=EOF) {
    24         memset(tree, 0, sizeof(tree));
    25         for (int i = 0; i < n; i++) {
    26             int x, y, z;
    27             scanf("%d%d%d", &x, &y, &z);
    28             tree[x][y][z]++;
    29         }
    30         dp();
    31         for (int i = 0; i < q; i++) {
    32             int t, x, y, xx, yy;
    33             scanf("%d%d%d%d%d", &t, &x, &y, &xx, &yy);
    34             int ans = 0;
    35             for (int j = 0; j <= c; j++) {
    36                 int s = (t + j) % (c + 1);
    37                 ans += s * add(j, x, y, xx, yy);
    38             }
    39             printf("%d
    ", ans);
    40         }
    41     }
    42 
    43     return 0;
    44 }
    
    
    




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  • 原文地址:https://www.cnblogs.com/zllwxm123/p/7270017.html
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