链接:http://poj.org/problem?id=2155
Description
Input
Output
Sample Input
1 2 10 C 2 1 2 2 Q 2 2 C 2 1 2 1 Q 1 1 C 1 1 2 1 C 1 2 1 2 C 1 1 2 2 Q 1 1 C 1 1 2 1 Q 2 1
Sample Output
1 0 0 1
代码如下:
#include <iostream>
#include <cstdio>
#include <cstring>
#include <cstdlib>
#define MAXN 1050
#define RST(N)memset(N, 0, sizeof(N))
using namespace std;
int map[MAXN][MAXN], cas;
int N, M, x1, y1, x2, y2, Mc, Md;
char ch;
int lowbit(int x) { return x & (-x); }
void Init() { scanf("%d %d", &N, &M); RST(map); }
void update(int x, int y, int d) //二维树状数组的更新(从大到小);
{
while(y > 0) {
int Mx = x;
while(Mx > 0) {
map[Mx][y] += d;
Mx -= lowbit(Mx);
}
y -= lowbit(y);
}
}
int getsum(int x, int y) //二维树状数组的求和(从小到大);
{
int sum = 0;
while(y <= N) {
int Mx = x;
while(Mx <= N) {
sum += map[Mx][y];
Mx += lowbit(Mx);
}
y += lowbit(y);
}
return sum;
}
int main()
{
scanf("%d", &cas);
while(cas--) {
Init();
while(M--) {
getchar();
scanf("%c", &ch);
if(ch == ‘C‘) {
scanf("%d %d %d %d", &x1, &y1, &x2, &y2);
update(x2, y2, 1);
update(x1-1, y2, -1);
update(x1-1, y1-1, 1);
update(x2, y1-1, -1);
}else if(ch == ‘Q‘) {
scanf("%d %d", &Mc, &Md);
int res = getsum(Mc, Md)%2;
printf("%d\n", res);
}
}
if(cas) puts("");
}
return 0;
}
POJ 2155 Matrix (二维树状数组),布布扣,bubuko.com
原文:http://blog.csdn.net/keshacookie/article/details/23270499