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NumberOfCornerRectangles.java
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29 lines (28 loc) · 990 Bytes
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public class NumberOfCornerRectangles {
public int countCornerRectangles(int[][] grid) {
int ans = 0;
for (int i = 0; i < grid.length - 1; i++) {
for (int j = i + 1; j < grid.length; j++) {
int counter = 0;
for (int k = 0; k < grid[0].length; k++) {
if (grid[i][k] == 1 && grid[j][k] == 1) counter++;
}
if (counter > 0) ans += counter * (counter - 1) / 2;
}
}
return ans;
}
public boolean existCornerRectangles(int[][] grid) {
int ans = 0;
for (int i = 0; i < grid.length - 1; i++) {
for (int j = i + 1; j < grid.length; j++) {
int counter = 0;
for (int k = 0; k < grid[0].length; k++) {
if (grid[i][k] == 1 && grid[j][k] == 1) counter++;
}
if (counter >= 2) return true
}
}
return false;
}
}