[Swust OJ 234]--IrreducibleNumber(题意太坑)

 1 #include <iostream>
 2 using namespace std;
 3 int a[5], vis[301];
 4 int main(){
 5     int n, i;
 6     while (cin >> n, n != -1){
 7         memset(vis, 0, sizeof(vis));
 8         for (i = 1; i <= n; i++){
 9             cin >> a[i];
10             vis[a[i]] = 1;
11         }
12         if (n == 2){
13             vis[a[1] + a[2]] = 1;
14         }
15         else{
16             vis[a[1] + a[2]] = 1;
17             vis[a[2] + a[3]] = 1;
18             vis[a[1] + a[3]] = 1;
19             vis[a[1] + a[2] + a[3]] = 1;
20         }
21         for (i = 1;; i++)
22         if (!vis[i]) {
23             cout << i << endl;
24             break;
25         }
26     }
27     return 0;
28 }