Compilare: user.cpp: In function ‘int getcost(std::__cxx11::string, std::__cxx11::string)’: user.cpp:27:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(j < a.size()) { ~~^~~~~~~~~~ user.cpp:42:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = b.size() ; i < a.size() ;i++){ ~~^~~~~~~~~~ user.cpp:43:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(pre[i] == b.size()){ ~~~~~~~^~~~~~~~~~~ user.cpp:23:7: warning: unused variable ‘n’ [-Wunused-variable] int n = b.size(); ^ user.cpp: In function ‘void printsol(int, int)’: user.cpp:56:53: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = v[pos].size() - cost[pos2][pos] ; i < v[pos].size() ;i++) ~~^~~~~~~~~~~~~~~ user.cpp:59:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < v[pos].size() ;i++) ~~^~~~~~~~~~~~~~~