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class Solution { public: int islandPerimeter(vector<vector<int>>& grid) { int n = grid.size(); int m = grid[0].size(); int squares = 0; int di[] = {0, 0, -1, 1}; int dj[] = {-1, 1, 0, 0}; for(int i = 0; i < n; i++) { for(int j = 0; j < m; j++) { if(grid[i][j] == 1) { squares += 4; for(int k = 0; k < 4; k++) { int ti = i + di[k]; int tj = j + dj[k]; if(ti >= 0 and ti < n and tj >= 0 and tj < m and grid[ti][tj] == 1) { squares--; } } } } } return squares; } };
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everlasting (like CCCP)
