LibreOJ 134. 二维树状数组 2:区间修改,单点查询

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#include <cstdio>

using namespace std;
using LL = long long;
const int N = 4097;
int n, m, a, b, c, d, k;
LL tree[N][N];

int lowbit(int x) {
return x & -x;
}

void add(int x, int y, int k) {
for (int i = x; i <= n; i += lowbit(i))
for (int j = y; j <= m; j += lowbit(j))
tree[i][j] += k;
}

LL getSum(int x, int y) {
LL s = 0;
for (int i = x; i > 0; i -= lowbit(i))
for (int j = y; j > 0; j -= lowbit(j))
s += tree[i][j];
return s;
}

int main() {
scanf("%d%d", &n, &m);
while (scanf("%d", &a) != EOF) {
if (a == 1) {
scanf("%d%d%d%d%d", &a, &b, &c, &d, &k);
add(a, b, k);
add(a, d + 1, -k);
add(c + 1, b, -k);
add(c + 1, d + 1, k);
} else {
scanf("%d%d", &a, &b);
printf("%lld\n", getSum(a, b));
}
}
return 0;
}