Compilare: user.cpp: In function ‘int main()’: user.cpp:21:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=i+1;j<s.size();++j) p=p*10+s[j]-'0'; ^ user.cpp: In function ‘void openIOFiles()’: user.cpp:6:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("7segmente.in","r",stdin); ^ user.cpp:7:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("7segmente.out","w",stdout); ^