• HDU 6336 Matrix from Arrays (杭电多校4E)


    遇事不决先打表。

    然后会发现(个屁)大的矩形是由一个2L*2L的矩形重复出现组成的然后我们就可以这个矩形分成四个点到(0, 0)点的矩形,这样问题就变成了求四个到顶点(0, 0)的矩形的面积,然后就先去求这里面完整的块数,然后去找边缘的有一边是完整的块,然后找最右下角的没有完整的块的面积,然后加起来就可了

    #include<map>
    #include<set>
    #include<ctime>
    #include<cmath>
    #include<stack>
    #include<queue>
    #include<string>
    #include<vector>
    #include<cstdio>
    #include<cstdlib>
    #include<cstring>
    #include<iostream>
    #include<algorithm>
    #define lowbit(x) (x & (-x))
    
    typedef unsigned long long int ull;
    typedef long long int ll;
    const double pi = 4.0*atan(1.0);
    const int inf = 0x3f3f3f3f;
    const int maxn = 1e5+10;
    const int maxm = 10000007;
    const int mod = 1e9+7;
    using namespace std;
    
    int n, m, tol, T;
    int L;
    int A[15];
    int M[100][100];
    ll sx[30];
    ll sy[30];
    ll sum;
    
    void init() {
        sum = 0;
        memset(A, 0, sizeof A);
        memset(M, 0, sizeof M);
        memset(sx, 0, sizeof sx);
        memset(sy, 0, sizeof sy);
    }
    
    ll solve(int x, int y) {
        ll ans = 0;
        int cx = x/L;
        int cy = y/L;
        ll t = 1ll * cx * cy;
        ans += 1ll * t * sum;
        int x1 = x % L;
        int y1 = y % L;
        ll s = 0;
        for(int i=1; i<=x1; i++)    s += sx[i];
        ans += s * cy;
        s = 0;
        for(int i=1; i<=y1; i++)    s += sy[i];
        ans += s * cx;
        for(int i=1; i<=x1; i++) {
            for(int j=1; j<=y1; j++) {
                ans += M[i][j];
            }
        }
        return ans;
    }
    
    int main() {
    //    freopen("in.txt", "r", stdin);
    //  freopen("out.txt", "w", stdout);
        scanf("%d", &T);
        while(T--) {
            init();
            scanf("%d", &L);
            for(int i=0; i<L; i++)    scanf("%d", &A[i]);
            int cursor = 0;
            for(int i=1; i<=4*L; i++) {
                for(int j=1; j<=i; j++) {
                    M[j][i - j + 1] = A[cursor];
                    cursor = (cursor + 1) % L;
                }
            }
            L <<= 1;
            for(int i=1; i<=L; i++) {
                for(int j=1; j<=L; j++) {
                    sy[j] += M[i][j];
                    sx[i] += M[i][j];
                }
                sum += sx[i];
            }
            /*
            for(int i=1; i<=L; i++)    for(int j=1; j<=L; j++)    printf("%d%c",M[i][j], j==L ? '
    ' : ' 	');
            for(int i=1; i<=L; i++)    printf("sx%d = %d
    ", i, sx[i]);
            for(int i=1; i<=L; i++)    printf("sy%d = %d
    ", i, sy[i]);
            */
            int q;
            scanf("%d", &q);
            while(q--) {
                int x1, y1, x2, y2;
                scanf("%d%d%d%d", &x1, &y1, &x2, &y2);
                x1++, y1++, x2++, y2++;
                ll ans = solve(x2, y2);
                ans -= solve(x1-1, y2);
                ans -= solve(x2, y1-1);
                ans += solve(x1-1, y1-1);
                printf("%lld
    ", ans);
            }
        }
        return 0;
    }
    View Code
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  • 原文地址:https://www.cnblogs.com/Jiaaaaaaaqi/p/9413245.html
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