Compilare: main.cpp: In function 'int main()': main.cpp:19:36: warning: right operand of comma operator has no effect [-Wunused-value] a[i][j].i = i, a[i][j].j; ~~~~~~~~^ main.cpp:13:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("traseu4.in", "r", stdin); ^ main.cpp:14:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("traseu4.out", "w", stdout); ^ main.cpp:15:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ main.cpp:19:37: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] a[i][j].i = i, a[i][j].j; ^