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联想2155:PKU 2155

/*MatrixTime Limit: 3000MS Memory Limit: 65536K Total Submissions: 5565 Accepted: 2047 DescriptionGiven an N*N matrix A, whose elements are either 0 or 1. A[i, j] means the number in the i-th row and j-th column. Initially we have A[i, j] = 0 (1 = i, j = N). We can change the matrix in the f [阅读全文] [PDF]