Compilare: main.cpp: In function 'int main()': main.cpp:24:30: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("ssm.in","r",stdin); ^ main.cpp:25:32: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("ssm.out","w",stdout); ^ main.cpp:44:30: warning: 'dr' may be used uninitialized in this function [-Wmaybe-uninitialized] cout<<sol<<" "<<st<<" "<<dr; ^ main.cpp:44:23: warning: 'st' may be used uninitialized in this function [-Wmaybe-uninitialized] cout<<sol<<" "<<st<<" "<<dr; ^~~