Compilare: user.cpp: In function ‘int main()’: user.cpp:8:34: 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); ^ user.cpp:9:36: 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); ^ user.cpp:28:20: warning: ‘beg’ may be used uninitialized in this function [-Wmaybe-uninitialized] cout<<sm<<" "<<beg<<" "<<end; ^ user.cpp:28:33: warning: ‘end’ may be used uninitialized in this function [-Wmaybe-uninitialized] cout<<sm<<" "<<beg<<" "<<end; ^