C++ why the Submission Result is "Memory Limit Exceeded"?


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    class Solution {
    public:
    int islandPerimeter(vector<vector<int>>& grid) {
    int count = 0;
    for(unsigned long i = 0; i < grid.size(); ++i) {
    for(unsigned long j = 0; j < grid[i].size(); ++j) {
    if(grid[i][j] == 1) {
    if(j == 0 || grid[i][j - 1] == 0) {
    ++count;
    }
    if(i == 0 || grid[i - 1][j] == 0) {
    ++count;
    }
    if(i == (grid.size() - 1) || grid[i + 1][j] == 0) {
    ++count;
    }
    if(j == (grid[0].size() - 1) || grid[i][j + 1] == 0) {
    ++count;
    }
    }
    }
    }
    return count;
    }
    };


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