思路:预处理cnt(i)表示前i个数中有多少天需要补提交卡,枚举各个连续区间,区间[j, i]中需要补提交卡的天数是cnt(i) - cnt(j-1),判断m是否大于等于cnt(i) - cnt(j-1),更新答案即可。
AC代码
#include <cstdio>
#include <cmath>
#include <cctype>
#include <algorithm>
#include <cstring>
#include <utility>
#include <string>
#include <iostream>
#include <map>
#include <set>
#include <vector>
#include <queue>
#include <stack>
using namespace std;
#pragma comment(linker, "/STACK:1024000000,1024000000")
#define eps 1e-10
#define inf 0x3f3f3f3f
#define PI pair<int, int>
typedef long long LL;
const int maxn = 100 + 5;
int a[maxn], cnt[maxn];
int main() {
int T;
scanf("%d", &T);
while(T--) {
memset(a, 0, sizeof(a));
int n, m;
scanf("%d%d", &n, &m);
int x;
for(int i = 1; i <= n; ++i) {
scanf("%d", &x);
a[x] = 1;
}
cnt[0] = 0;
for(int i = 1; i <= 100; ++i) {
cnt[i] = cnt[i-1];
if(a[i]) cnt[i]++;
}
int ans = 0;
for(int i = 1; i <= 100; ++i) {
for(int j = 1; j <= i; ++j) {
int tol = cnt[i] - cnt[j-1];
if(m >= tol) ans = max(ans, i - j + 1);
}
}
printf("%d\n", ans);
}
return 0;
}
如有不当之处欢迎指出!