Compilare: main.cpp: In function 'int main()': main.cpp:37:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(oi[i].size()>i) jbegin=oi[i].size()-i-1; ~~~~~~~~~~~~^~ main.cpp:38:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=jbegin;j<oi[i].size();j++) ~^~~~~~~~~~~~~ main.cpp:40:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(sol.size()<=i) ~~~~~~~~~~^~~ main.cpp:55:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<sol.size();i++) {s+=sol[i];} ~^~~~~~~~~~~ main.cpp:15:33: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("lupu.in","r",stdin); ^ main.cpp:16:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("lupu.out","w",stdout); ^