51Nod1127 最小包含字符串

51Nod1127

 #include <iostream>
 #include <string>
 using namespace std;
 const int inf = 0x3f3f3f3f;
 int vis[];
 int main() {
     string s; cin >> s;
     int l = , r = , sum = , ans = inf;
     while (l <= r && r < s.size()) {
         if (vis[s[r]-'A'] == false) sum++;
         vis[s[r]-'A']++;
         while (sum == ) {
             ans = min(ans,r-l+);
             if (vis[s[l]-'A'] == ) sum--;
             vis[s[l]-'A']--;
             l++;
         }
         r++;
     }
     if (ans == inf) cout << "No Solution" << endl;
     else cout << ans << endl;
     return ;
 }