func_code_string: #include <bits/stdc++.h>   using namespace std;   int n, x, y, neg, pos;   int main() {     cin >> n;     for (int i = 0; i < n; i++) {       cin >> x >> y;       if (x < 0)         neg++;       else         pos++;     }     if (pos <= 1 || neg <= 1)       cout <<  Yes ;     else       cout <<  No ;     return 0;   }   