#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
int n;
string s;
ll dp[100001][3];
char joi[4];
ll get(int a,int b){
if(b==0)return 1;
if(a>=n)return 0;
if(dp[a][b]>=0)return dp[a][b];
if(joi[b]==s[a])return dp[a][b]=get(a+1,b)+get(a+1,b-1);
return dp[a][b]=get(a+1,b);
}
int main()
{ cout <<fixed;cout.precision(12);cin.tie(0);
ios_base::sync_with_stdio(false);
memset(dp,-1,sizeof(dp));
cin >> n;
cin >> s;
joi[1]='I';
joi[2]='O';
joi[3]='J';
ll res=get(0,3);
ll add=get(0,2);
joi[2]='J';
joi[1]='O';
memset(dp,-1,sizeof(dp));
add=max(add,get(0,2));
int jnum=0;
int inum=0;
for(int i=0;i<n;i++)
if(s[i]=='I')inum++;
for(int i=0;i<n;i++){
if(s[i]=='J')jnum++;
if(s[i]=='I')inum--;
add=max(add,1LL*jnum*inum);
}
cout << res+add;
}
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
4 ms |
2620 KB |
Output is correct |
| 2 |
Correct |
4 ms |
2680 KB |
Output is correct |
| 3 |
Correct |
4 ms |
2680 KB |
Output is correct |
| 4 |
Correct |
4 ms |
2764 KB |
Output is correct |
| 5 |
Correct |
4 ms |
2680 KB |
Output is correct |
| 6 |
Correct |
4 ms |
2680 KB |
Output is correct |
| 7 |
Correct |
4 ms |
2680 KB |
Output is correct |
| 8 |
Correct |
4 ms |
2680 KB |
Output is correct |
| 9 |
Correct |
4 ms |
2680 KB |
Output is correct |
| 10 |
Correct |
4 ms |
2760 KB |
Output is correct |
| 11 |
Correct |
4 ms |
2680 KB |
Output is correct |
| 12 |
Correct |
4 ms |
2680 KB |
Output is correct |
| 13 |
Correct |
4 ms |
2768 KB |
Output is correct |
| 14 |
Correct |
4 ms |
2680 KB |
Output is correct |
| 15 |
Correct |
4 ms |
2680 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
4 ms |
2620 KB |
Output is correct |
| 2 |
Correct |
4 ms |
2680 KB |
Output is correct |
| 3 |
Correct |
4 ms |
2680 KB |
Output is correct |
| 4 |
Correct |
4 ms |
2764 KB |
Output is correct |
| 5 |
Correct |
4 ms |
2680 KB |
Output is correct |
| 6 |
Correct |
4 ms |
2680 KB |
Output is correct |
| 7 |
Correct |
4 ms |
2680 KB |
Output is correct |
| 8 |
Correct |
4 ms |
2680 KB |
Output is correct |
| 9 |
Correct |
4 ms |
2680 KB |
Output is correct |
| 10 |
Correct |
4 ms |
2760 KB |
Output is correct |
| 11 |
Correct |
4 ms |
2680 KB |
Output is correct |
| 12 |
Correct |
4 ms |
2680 KB |
Output is correct |
| 13 |
Correct |
4 ms |
2768 KB |
Output is correct |
| 14 |
Correct |
4 ms |
2680 KB |
Output is correct |
| 15 |
Correct |
4 ms |
2680 KB |
Output is correct |
| 16 |
Correct |
6 ms |
2808 KB |
Output is correct |
| 17 |
Correct |
6 ms |
2808 KB |
Output is correct |
| 18 |
Correct |
4 ms |
2808 KB |
Output is correct |
| 19 |
Correct |
5 ms |
2808 KB |
Output is correct |
| 20 |
Correct |
4 ms |
2808 KB |
Output is correct |
| 21 |
Correct |
4 ms |
2880 KB |
Output is correct |
| 22 |
Correct |
4 ms |
2780 KB |
Output is correct |
| 23 |
Correct |
4 ms |
2856 KB |
Output is correct |
| 24 |
Correct |
4 ms |
2808 KB |
Output is correct |
| 25 |
Correct |
5 ms |
2940 KB |
Output is correct |
| 26 |
Correct |
4 ms |
2808 KB |
Output is correct |
| 27 |
Correct |
4 ms |
2808 KB |
Output is correct |
| 28 |
Correct |
4 ms |
2812 KB |
Output is correct |
| 29 |
Correct |
4 ms |
2780 KB |
Output is correct |
| 30 |
Correct |
5 ms |
2780 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
4 ms |
2620 KB |
Output is correct |
| 2 |
Correct |
4 ms |
2680 KB |
Output is correct |
| 3 |
Correct |
4 ms |
2680 KB |
Output is correct |
| 4 |
Correct |
4 ms |
2764 KB |
Output is correct |
| 5 |
Correct |
4 ms |
2680 KB |
Output is correct |
| 6 |
Correct |
4 ms |
2680 KB |
Output is correct |
| 7 |
Correct |
4 ms |
2680 KB |
Output is correct |
| 8 |
Correct |
4 ms |
2680 KB |
Output is correct |
| 9 |
Correct |
4 ms |
2680 KB |
Output is correct |
| 10 |
Correct |
4 ms |
2760 KB |
Output is correct |
| 11 |
Correct |
4 ms |
2680 KB |
Output is correct |
| 12 |
Correct |
4 ms |
2680 KB |
Output is correct |
| 13 |
Correct |
4 ms |
2768 KB |
Output is correct |
| 14 |
Correct |
4 ms |
2680 KB |
Output is correct |
| 15 |
Correct |
4 ms |
2680 KB |
Output is correct |
| 16 |
Correct |
6 ms |
2808 KB |
Output is correct |
| 17 |
Correct |
6 ms |
2808 KB |
Output is correct |
| 18 |
Correct |
4 ms |
2808 KB |
Output is correct |
| 19 |
Correct |
5 ms |
2808 KB |
Output is correct |
| 20 |
Correct |
4 ms |
2808 KB |
Output is correct |
| 21 |
Correct |
4 ms |
2880 KB |
Output is correct |
| 22 |
Correct |
4 ms |
2780 KB |
Output is correct |
| 23 |
Correct |
4 ms |
2856 KB |
Output is correct |
| 24 |
Correct |
4 ms |
2808 KB |
Output is correct |
| 25 |
Correct |
5 ms |
2940 KB |
Output is correct |
| 26 |
Correct |
4 ms |
2808 KB |
Output is correct |
| 27 |
Correct |
4 ms |
2808 KB |
Output is correct |
| 28 |
Correct |
4 ms |
2812 KB |
Output is correct |
| 29 |
Correct |
4 ms |
2780 KB |
Output is correct |
| 30 |
Correct |
5 ms |
2780 KB |
Output is correct |
| 31 |
Correct |
15 ms |
7672 KB |
Output is correct |
| 32 |
Correct |
13 ms |
7668 KB |
Output is correct |
| 33 |
Correct |
14 ms |
7716 KB |
Output is correct |
| 34 |
Correct |
14 ms |
7648 KB |
Output is correct |
| 35 |
Correct |
13 ms |
7672 KB |
Output is correct |
| 36 |
Correct |
16 ms |
7672 KB |
Output is correct |
| 37 |
Correct |
16 ms |
7636 KB |
Output is correct |
| 38 |
Correct |
16 ms |
7672 KB |
Output is correct |
| 39 |
Correct |
16 ms |
7672 KB |
Output is correct |
| 40 |
Correct |
17 ms |
7672 KB |
Output is correct |
| 41 |
Correct |
16 ms |
7644 KB |
Output is correct |
| 42 |
Correct |
15 ms |
7672 KB |
Output is correct |
| 43 |
Correct |
15 ms |
7672 KB |
Output is correct |
| 44 |
Correct |
15 ms |
7672 KB |
Output is correct |
| 45 |
Correct |
13 ms |
7676 KB |
Output is correct |
