1127 最短的包含字符串

#include <cmath>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <iostream>
#include <string>
#include <vector>
#include <deque>
#include <queue>
#include <algorithm>
using namespace std;
const int maxn = 100000;
const int inf  = 0x3f3f3f3f;
char s[maxn];
int  cnt[30];
deque<int> dq;
int cur_cnt, n;

int main() {
    
    int ans = inf;
    scanf("%s", s);
    n = strlen(s);
    cur_cnt = 0;
    for(int i = 0; i < n; ++i) {
        dq.push_back(i);
        if(cnt[s[i]-'A'] == 0) {
            cur_cnt++;
        }
        cnt[s[i]-'A']++;
        if(cur_cnt >= 26) {
            while(cur_cnt >= 26) {
                ans = min(ans, dq.back() - dq.front() + 1);
                if(--cnt[s[dq.front()]-'A'] == 0) {
                    --cur_cnt;
                }
                dq.pop_front();
            }
        }
    }
    if(ans < inf) printf("%d\n", ans);
    else printf("No Solution\n");
    return 0;
}