Compilare: user.cpp: In function ‘void solve(int)’: user.cpp:13:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[x].size();++i) ^ user.cpp: In function ‘int main()’: user.cpp:42:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<v[i].size();++j) ^ user.cpp:25:11: warning: unused variable ‘m’ [-Wunused-variable] int n,m,i,ok,t,x,y; ^