Compilare: user.cpp: In function ‘void solve(int, int)’: user.cpp:101:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(p<b.size() && b[p].sum == P && b[p].dif == df) ^ user.cpp: In function ‘int main()’: user.cpp:168:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(p<b.size() && b[p].sum < q[i].p) ++p; ^ user.cpp:170:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(p<b.size() && b[p].sum == q[i].p) ^