C++ 初始化二维vector

• 初始化

vector<vector<int>> v(r, vector<int>(c, 0));

• resize()

vector<vector<int>> v;
v.resize(r); // row
for (int i = 0; i < r; ++i){
    v[i].resize(c); // column
}

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参考：https://blog.youkuaiyun.com/sinat_36053757/article/details/71053706