'commit'

TangDou/AcWing/PrefixAndDifference/798.cpp

@@ -0,0 +1,46 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+const int N = 1010;
+int a[N][N], b[N][N];
+int n, m, q;
+
+/**
+ * 功能：二维差分构建
+ * @param x1 左上角横坐标
+ * @param y1 左上角纵坐标
+ * @param x2 右下角横坐标
+ * @param y2 右下角纵坐标
+ * @param c  值
+ */
+void insert(int x1, int y1, int x2, int y2, int c) {
+    b[x1][y1] += c;
+    b[x2 + 1][y1] -= c;
+    b[x1][y2 + 1] -= c;
+    b[x2 + 1][y2 + 1] += c;
+}
+
+int main() {
+    cin >> n >> m >> q;
+    //读入并构建
+    for (int i = 1; i <= n; i++)
+        for (int j = 1; j <= m; j++)
+            cin >> a[i][j], insert(i, j, i, j, a[i][j]);
+
+    //q次区域变化
+    while (q--) {
+        int x1, y1, x2, y2, c;
+        cin >> x1 >> y1 >> x2 >> y2 >> c;
+        insert(x1, y1, x2, y2, c);
+    }
+    //还原二维数组
+    for (int i = 1; i <= n; i++) {
+        for (int j = 1; j <= m; j++) {//二维前缀和公式
+            a[i][j] = a[i - 1][j] + a[i][j - 1] - a[i - 1][j - 1]
+                      + b[i][j];
+            printf("%d ", a[i][j]);
+        }
+        printf("\n");
+    }
+    return 0;
+}