Compilare: main.cpp: In function 'void solve()': main.cpp:69:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<pos.size();i++) ~^~~~~~~~~~~ main.cpp:72:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<pos.size();i++) ~^~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:92:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<ans.size();i++) ~^~~~~~~~~~~