Compilare: main.cpp: In function 'std::__cxx11::string solve(int, int)': main.cpp:34:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i<le.size()&&j<ri.size()) ~^~~~~~~~~~ main.cpp:34:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i<le.size()&&j<ri.size()) ~^~~~~~~~~~ main.cpp:39:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int p=j;p<ri.size();p++)now.push_back(ri[p]); ~^~~~~~~~~~ main.cpp:41:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(query(now)==now.size()) ~~~~~~~~~~^~~~~~~~~~~~ main.cpp:53:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i<le.size()) ~^~~~~~~~~~ main.cpp:59:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(j<ri.size()) ~^~~~~~~~~~