Compilare: user.cpp: In function ‘int main()’: user.cpp:61:7: warning: unused variable ‘mx’ [-Wunused-variable] int mx = 0; ^ user.cpp:31:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("minlcm.in", "r", stdin); ^ user.cpp:32:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("minlcm.out", "w", stdout); ^ user.cpp:53:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &test); ^ user.cpp:56:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:57:52: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for (int i = 1; i <= n; ++i) { scanf("%d", &a[i]); viz[a[i]]=1; } ^ user.cpp:105:52: warning: ‘x2’ may be used uninitialized in this function [-Wmaybe-uninitialized] printf("%lld\n", (x1*x2) / (long long )gcd(x1, x2)); ^ user.cpp:91:26: warning: ‘x1’ may be used uninitialized in this function [-Wmaybe-uninitialized] if ( x1 != p[i][j] && viz[p[i][j]]){ ^