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class Solution {
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 public:
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  bool isToeplitzMatrix(vector<vector<int>> &matrix) {
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    int m = matrix.size(), n = matrix[0].size();
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    for (int i = 1; i < m; i++)
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      for (int j = 1; j < n; j++)
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        if (matrix[i][j] != matrix[i - 1][j - 1]) return false;
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    return true;
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  }
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};