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-rw-r--r--max_area_island.cpp24
1 files changed, 24 insertions, 0 deletions
diff --git a/max_area_island.cpp b/max_area_island.cpp
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--- /dev/null
+++ b/max_area_island.cpp
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+#include "leetcode.h"
+
+class Solution {
+public:
+ int maxAreaOfIsland(vector<vector<int>> &grid) {
+ int ans = 0;
+ n = grid.size(), m = grid[0].size();
+ for (int i = 0; i < n; i++)
+ for (int j = 0; j < m; j++)
+ if (grid[i][j])
+ ans = max(ans, helper(i, j, grid));
+ return ans;
+ }
+
+private:
+ int n = 0, m = 0;
+ int helper(int i, int j, vector<vector<int>> &grid) {
+ if (i < 0 || j < 0 || i >= n || j >= m || !grid[i][j])
+ return 0;
+ grid[i][j] = 0;
+ return 1 + helper(i - 1, j, grid) + helper(i, j - 1, grid) +
+ helper(i + 1, j, grid) + helper(i, j + 1, grid);
+ }
+};