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https://leetcode.com/problems/toeplitz-matrix/
//判断每个值是否等于左上角值
class Solution {
public:
bool isToeplitzMatrix(vector<vector<int>>& matrix) {
int row = matrix.size(), col = matrix[0].size();
for(int i=1; i<row; i++){
for(int j=0; j<col; j++){
if(j-1>=0){
if(matrix[i][j]!=matrix[i-1][j-1]) return false;
}
}
}
return true;
}
};