Ice cream samples Gym - 101670G 滑动扫描

题目：题目链接

思路：比赛中读错了题，题目要求选一个连续区间，却读成了随便选取几个柜台，英语要好好学啊，读懂题就很简单了，扫一遍就出结果了

AC代码：

 1 #include <iostream>
 2 #include <cstdio>
 3 #include <cstdlib>
 4 #include <cmath>
 5 #include <algorithm>
 6 #include <cstring>
 7 #include <vector>
 8 #include <string>
 9 #include <queue>
10 #include <map>
11 #include <set>
12
13 #define FRER() freopen("in.txt", "r", stdin);
14 #define INF 0x3f3f3f3f
15
16 using namespace std;
17
18 const int maxn = 1000000 + 5;
19
20 vector<int> stand[maxn << 1];
21
22 int brand[maxn], N, K;
23
24 void init() {
25     for(int i = 0; i < (N << 1); ++i)
26         stand[i].clear();
27     memset(brand, 0, sizeof(brand));
28 }
29
30 int solve() {
31     int st = 0, ed = 0, ans = INF, k = 0, now = 0;
32     while(ed < (N << 1)) {
33         for(int i = 0; i < stand[ed].size(); ++i) {
34             ++now;
35             if(brand[stand[ed][i]] == 0)
36                 ++k;
37             ++brand[stand[ed][i]];
38         }
39         ++ed;
40         while(k == K && st < ed) {
41             ans = min(ans, now);
42             for(int i = 0; i < stand[st].size(); ++i) {
43                 --now;
44                 --brand[stand[st][i]];
45                 if(brand[stand[st][i]] == 0)
46                     --k;
47             }
48             ++st;
49         }
50     }
51     return ans == INF ? -1 : ans;
52 }
53
54 int main()
55 {
56     //FRER()
57     while(~scanf("%d %d", &N, &K)) {
58         init();
59         int n, num;
60         for(int i = 0; i < N; ++i) {
61             scanf("%d", &n);
62             for(int j = 0; j < n; ++j) {
63                 scanf("%d", &num);
64                 stand[i].push_back(num);
65                 stand[i + N].push_back(num);
66             }
67         }
68         printf("%d\n", solve());
69     }
70     return 0;
71 }

原文地址：https://www.cnblogs.com/fan-jiaming/p/9833770.html