Submission #1208086

#	Time	Username	Problem	Language	Result	Execution time	Memory
1208086		PlayVoltz	스탬프 수집 (JOI16_ho_t2)	C++20	100 / 100	3 ms	840 KiB

2016_ho_t2

#include <cstdio>
#include <stdio.h>
#include <stdbool.h>
#include <iostream>
#include <map>
#include <vector>
#include <climits>
#include <stack>
#include <string>
#include <queue>
#include <algorithm>
#include <set>
#include <unordered_set>
#include <unordered_map>
#include <cmath>
#include <cctype>
#include <bitset>
#include <iomanip>
#include <cstring>
#include <numeric>
#include <cassert>
#include <chrono>
using namespace std;

#define int long long
#define pii pair<int, int>
#define mp make_pair
#define pb push_back
#define fi first
#define se second

int calc(string s){
	int j=0, o=0, i=0;
	for (auto a:s){
		if (a=='J')++j;
		else if (a=='O')o+=j;
		else i+=o;
	}
	return i;
}

int32_t main(){
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	int n, mx=0, j=0, i=0;
	string s;
	cin>>n>>s;
	for (auto a:s)if (a=='I')++i;
	for (auto a:s){
		if (a=='J')++j;
		else if (a=='I')--i;
		mx=max(mx, j*i);
	}
	cout<<max({mx+calc(s), calc("J"+s), calc(s+"I")});
}

• Subtask 1: 30 / 30
• Subtask 2: 20 / 20
• Subtask 3: 50 / 50