原题题目

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代码实现（首刷自解）

class Solution {
public:
    int matrixScore(vector<vector<int>>& grid) {
        int ret = 0;
        for(int x=0;x<grid.size();++x)
        {
            if(grid[x][0])  continue;
            else
            {
                for(int y=0;y<grid[0].size();++y)
                    grid[x][y] ^= 1;
            }
        }
        ret += (1<<(grid[0].size()-1)) * grid.size();
        for(int y=1;y<grid[0].size();++y)
        {
            int count = 0;
            for(int x=0;x<grid.size();++x)
                if(grid[x][y])  ++count;
            ret += (1<<(grid[0].size()-1-y)) * (grid.size() >= 2*count ? grid.size()-count : count); 
        }
        return ret;
    }
};