Compilare: user.cpp: In function ‘int main()’: user.cpp:43:55: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<g[mn.second.first].size();i++){ ^ user.cpp:49:56: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<g[mn.second.second].size();i++){ ^ user.cpp:54:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(f.size()==n-1){ ^ user.cpp:56:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<f.size();i++){ ^ user.cpp:63:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<f.size();i++){ ^