设置两个布尔数组,记录行和列是否存在0。需要注意的是如何将行或列设为0.

void setZeros(vector<vector<int>> &matrix)
{
int m = matrix.size();
int n = matrix[].size(); vector<bool>row(m, false);
vector<bool>col(n, false); for (int i = ; i < m;i++)
for (int j = ; j < n; j++)
{
if (matrix[i][j] == )
row[i] = col[j] = true;
} for (int i = ; i < m; i++)
{
if (row[i] == true)
fill(&matrix[i][], &matrix[i][] + n, );
}
for (int j = ; j < n; j++)
{
if (col[j] == true)
{
for (int i = ; i < m; i++)
matrix[i][j] = ;
}
}

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