Compilare: user.cpp: In function ‘void sol(int)’: user.cpp:23:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<sizeof(P)&&1LL*P[i]*P[i]<=n&&P[i]!=0;i++){ ^ user.cpp: In function ‘void solve(long long unsigned int)’: user.cpp:41:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (n%2!=t%2) ^ user.cpp:48:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (d+n/d<SumMin){ ^ user.cpp: In function ‘int main()’: user.cpp:63:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("cmmmc.in", "r", stdin); ^ user.cpp:64:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("cmmmc.out", "w", stdout); ^ user.cpp:68:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d", &n); ^ user.cpp:70:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d", &x); ^