Compilare: main.cpp: In function 'int verif(int, int)': main.cpp:46:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[x].size();i++) ~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:61:34: warning: overflow in implicit constant conversion [-Woverflow] int n,m,x,y,i=1,mx=0,res=LONG_MIN; ^~~~~~~~ main.cpp:86:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<vr[tops[i]].size();j++) ~^~~~~~~~~~~~~~~~~~~