P4549 【模板】裴蜀定理

 1 #include <bits/stdc++.h>
 2 using namespace std;
 3 int main() {
 4     int n; scanf("%d",&n);
 5     int ans;
 6     for (int i = 1; i <= n; ++i) {
 7         int x; scanf("%d",&x);
 8         x = abs(x);
 9         if (i == 1) ans = x;
10         else ans = __gcd(ans,x);
11     }
12     printf("%d\n",ans);
13     return 0;
14 }