'commit'

TangDou/AcWing/BIT/POJ2155.cpp

@@ -0,0 +1,53 @@
+#include <iostream>
+#include <cstdio>
+#include <cstring>
+const int N = 1010;
+using namespace std;
+
+int n, m;
+string str;
+int c[N][N];
+
+#define lowbit(x) (x & -x)
+void add(int x, int y, int v) {
+    for (int i = x; i < N; i += lowbit(i))
+        for (int j = y; j < N; j += lowbit(j))
+            c[i][j] += v;
+}
+
+int sum(int x, int y) {
+    int res = 0;
+    for (int i = x; i; i -= lowbit(i))
+        for (int j = y; j; j -= lowbit(j))
+            res += c[i][j];
+    return res;
+}
+
+int main() {
+    // 加快读入
+    ios::sync_with_stdio(false), cin.tie(0);
+    int T;
+    cin >> T;
+    while (T--) {
+        memset(c, 0, sizeof(c));
+        cin >> n >> m;
+        while (m--) {
+            cin >> str;
+            if (str[0] == 'C') {
+                int x1, y1, x2, y2;
+                cin >> x1 >> y1 >> x2 >> y2;
+                // 二维差分
+                add(x1, y1, 1);
+                add(x2 + 1, y1, -1);
+                add(x1, y2 + 1, -1);
+                add(x2 + 1, y2 + 1, 1);
+            } else {
+                int x, y;
+                cin >> x >> y;
+                printf("%d\n", sum(x, y) % 2);
+            }
+        }
+        if (T) puts("");
+    }
+    return 0;
+}