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Java Solution for LeetCode algorithm problems, continually updating
package g2101_2200.s2132_stamping_the_grid;
// #Hard #Array #Greedy #Matrix #Prefix_Sum #2022_06_06_Time_7_ms_(100.00%)_Space_86.8_MB_(81.21%)
public class Solution {
private boolean canPaved(int[][] grid, int is, int js, int ie, int je) {
for (int i = is; i <= ie; i++) {
for (int j = js; j <= je; j++) {
if (grid[i][j] == 1) {
return true;
}
}
}
return false;
}
public boolean possibleToStamp(int[][] grid, int h, int w) {
int rl = grid[0].length;
for (int i = 0; i < grid.length; i++) {
int[] row = grid[i];
int prev = -1;
for (int j = 0; j < row.length; j++) {
if (row[j] == 0) {
if (j + 1 < rl
&& row[j + 1] == 1
&& j - w + 1 >= 0
&& i + 1 < grid.length
&& grid[i + 1][j] == 1
&& i - h + 1 >= 0
&& canPaved(grid, i - h + 1, j - w + 1, i, j)) {
return false;
}
continue;
}
if (1 < j - prev && j - prev <= w) {
return false;
}
prev = j;
}
if (1 < row.length - prev && row.length - prev <= w) {
return false;
}
}
for (int i = 0; i < rl; i++) {
int prev = -1;
for (int j = 0; j < grid.length; j++) {
if (grid[j][i] == 0) {
continue;
}
if (1 < j - prev && j - prev <= h) {
return false;
}
prev = j;
}
if (1 < grid.length - prev && grid.length - prev <= h) {
return false;
}
}
return true;
}
}