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one loop with single variable.
int diagonalDifference(vector<vector<int>> arr) { int sum1 = 0; int sum2 = 0; for(int i = 0; i < arr.size(); i++){ sum1 += arr[i][i]; sum2 += arr[i][arr.size()-1-i]; } return abs(sum1-sum2); }
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Diagonal Difference
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one loop with single variable.