Compilare: user.cpp: In function ‘void solve(int, int, int)’: user.cpp:13:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(x=0;x<v[i].size();x++) ^ user.cpp: In function ‘void rez(int)’: user.cpp:27:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int x=0;x<sol.size();x++) ^ user.cpp:40:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int x=0;x<v[n].size();x++) ^ user.cpp: In function ‘int main()’: user.cpp:69:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int x=0;x<sol.size();x++) ^