Submission #1307057

#	Time	Username	Problem	Language	Result	Execution time	Memory
1307057		nanaseyuzuki	JOIOJI (JOI14_joioji)	C++20	100 / 100	32 ms	6120 KiB

joioji

#include <bits/stdc++.h>
// Kazusa_Megumi
#define ll long long
#define fi first
#define se second
#define pii pair<int, int>
#define all(a) a.begin(), a.end()
using namespace std;

const int mn = 5e5 + 5, mod = 1e9 + 7, inf = 2e9;

int n;
string s;
map <pii, int> mp;

void solve() {
    cin >> n >> s;
    s = "#" + s;
    int cur12 = 0, cur23 = 0, res = 0;
    mp[{0, 0}] = 0;
    for(int i = 1; i <= n; i++){
    	if(s[i] == 'J') cur12 ++;
    	else if(s[i] == 'O') cur12 --, cur23 ++;
    	else cur23 --; 

    	if(!mp.count({cur12, cur23})) mp[{cur12, cur23}] = i;
    	else res = max(res, i - mp[{cur12, cur23}]);
    }
    cout << res << '\n';
}

main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr); cout.tie(nullptr);
    if (fopen("Kazuki.INP", "r")) {
        freopen("Kazuki.INP", "r", stdin);
        freopen("Kazuki.OUT", "w", stdout);
    }
    int t = 1;
    // cin >> t;
    while (t--) solve();
    return 0;
}

Compilation message (stderr)

joioji.cpp:32:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   32 | main() {
      | ^~~~
joioji.cpp: In function 'int main()':
joioji.cpp:36:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   36 |         freopen("Kazuki.INP", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
joioji.cpp:37:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   37 |         freopen("Kazuki.OUT", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 15 / 15
• Subtask 3: 80 / 80