Submission #364858

#	Time	Username	Problem	Language	Result	Execution time	Memory
364858		Sparky_09	JOIOJI (JOI14_joioji)	C++17	100 / 100	45 ms	6264 KiB

joioji

#include "bits/stdc++.h"
using namespace std;
#define rep(i, a, b) for(int i = a; i < (b); ++i)
#define all(x) begin(x), end(x)
#define trav(a, x) for(auto& a : x)
#define sz(x) (int)(x).size()
typedef long long ll;
typedef pair<ll, ll> pii;
typedef vector<ll> vi;
typedef vector<pii> vpi;

void usaco(string s){
  freopen((s+".in").c_str(), "r", stdin);
  freopen((s+".out").c_str(), "w", stdout);
}

int main() {
	cin.tie(0)->sync_with_stdio(0);
	cin.exceptions(cin.failbit);
#ifdef LOCAL_DEFINE
	freopen("input.txt", "r", stdin);
#endif
  int n;
  cin >> n;
  string s;
  cin >> s;
  map<pair<int, int>, int> m;
  m[make_pair(0, 0)] = 0;
  int js=0,is=0,os=0,ans=0;
  rep(i, 0, n){
    if(s[i]=='J') js++; else if(s[i]=='O') os++; else is++;
    if(m.find(make_pair(js-os,js-is))==m.end()) m[make_pair(js-os,js-is)] = i+1;
    else ans = max(ans, i+1-m[make_pair(js-os,js-is)]);
  }
  cout << ans << '\n';
}

Compilation message (stderr)

joioji.cpp: In function 'void usaco(std::string)':
joioji.cpp:13:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   13 |   freopen((s+".in").c_str(), "r", stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
joioji.cpp:14:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   14 |   freopen((s+".out").c_str(), "w", stdout);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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