Compilare: main.cpp: In function 'int main()': main.cpp:78:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("overpower.in","r",stdin); ^ main.cpp:79:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("overpower.out","w",stdout); ^ main.cpp: In function 'long long int solve(long long int, long long int)': main.cpp:63:35: warning: 'ans' may be used uninitialized in this function [-Wmaybe-uninitialized] long long left=1,right=60,mid,ans; ^~~