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- from math import *
- x = int(input("Введите размер матрицы\n"))
- matrix = [0] * x
- for i in range(x):
- matrix[i] = [0] * x
- sum = 0
- for i in range(x):
- matrix[i] = list(map(int, input().split()))
- for i in range(x):
- for j in range(x):
- if (i == j):
- sum += matrix[i][j]
- print(sum)
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