题解 | 上三角矩阵判定
上三角矩阵判定
https://www.nowcoder.com/practice/f5a29bacfc514e5a935723857e1245e4
n = int(input())
matrix = [list(map(int,input().strip().split())) for _ in range(n)]
def is_upper_triangular(m,matrix):
for i in range(1,n):
for j in range(i):
if matrix[i][j] != 0:
return "NO"
return "YES"
print(is_upper_triangular(n,matrix))
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