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  • Star sky 二维前缀和

    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 (xiyi), 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 (x1iy1i) and the upper right — (x2iy2i). 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 nqc (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 xiyisi (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 tix1iy1ix2iy2i (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
    Copy
    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
    Copy
    3
    0
    3
    input
    Copy
    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
    Copy
    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.

    http://codeforces.com/contest/835/problem/C

    这题就是暴力二位前缀和

     1 #include <cstdio>
     2 #include <cstring>
     3 #include <queue>
     4 #include <cmath>
     5 #include <algorithm>
     6 #include <set>
     7 #include <iostream>
     8 #include <map>
     9 #include <stack>
    10 #include <string>
    11 #include <vector>
    12 #define  pi acos(-1.0)
    13 #define  eps 1e-6
    14 #define  fi first
    15 #define  se second
    16 #define  lson l,m,rt<<1
    17 #define  rson m+1,r,rt<<1|1
    18 #define  bug         printf("******
    ")
    19 #define  mem(a,b)    memset(a,b,sizeof(a))
    20 #define  fuck(x)     cout<<"["<<x<<"]"<<endl
    21 #define  f(a)        a*a
    22 #define  sf(n)       scanf("%d", &n)
    23 #define  sff(a,b)    scanf("%d %d", &a, &b)
    24 #define  sfff(a,b,c) scanf("%d %d %d", &a, &b, &c)
    25 #define  sffff(a,b,c,d) scanf("%d %d %d %d", &a, &b, &c, &d)
    26 #define  pf          printf
    27 #define  FRE(i,a,b)  for(i = a; i <= b; i++)
    28 #define  FREE(i,a,b) for(i = a; i >= b; i--)
    29 #define  FRL(i,a,b)  for(i = a; i < b; i++)
    30 #define  FRLL(i,a,b) for(i = a; i > b; i--)
    31 #define  FIN         freopen("DATA.txt","r",stdin)
    32 #define  gcd(a,b)    __gcd(a,b)
    33 #define  lowbit(x)   x&-x
    34 #pragma  comment (linker,"/STACK:102400000,102400000")
    35 using namespace std;
    36 typedef long long LL;
    37 const int maxn = 1e6 + 10;
    38 int n, q, c, sum[105][105][12];
    39 
    40 int main() {
    41     sfff(n, q, c);
    42     for (int i = 0, x, y, s ; i < n ; i++) {
    43         sfff(x, y, s);
    44         sum[x][y][s]++;
    45     }
    46     for (int i = 1 ; i <= 100 ; i++)
    47         for (int j = 1 ; j <= 100 ; j++)
    48             for (int k = 0 ; k <= c ; k++)
    49                 sum[i][j][k] += sum[i - 1][j][k] + sum[i][j - 1][k] - sum[i - 1][j - 1][k];
    50     int  t, x1, y1, x2, y2;
    51     while(q--) {
    52         sf(t);
    53         sffff(x1,y1,x2,y2);
    54         int ans = 0;
    55         for (int i = 0 ; i <= c ; i++)
    56             ans += (sum[x2][y2][i] - sum[x1 - 1][y2][i] - sum[x2][y1 - 1][i] + sum[x1 - 1][y1 - 1][i]) * ((i + t) % (c + 1));
    57         printf("%d
    ", ans);
    58     }
    59     return 0;
    60 }
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  • 原文地址:https://www.cnblogs.com/qldabiaoge/p/9440141.html
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