제출 #381649

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
381649		AdiZer0	Doktor (COCI17_doktor)	C++17	100 / 100	598 ms	32468 KiB

doktor

#include <bits/stdc++.h>

#define pb push_back
#define whole(x) x.begin(), x.end()
#define sz(x) (int)x.size()

using namespace std;

typedef long long ll;
typedef long double ld;

const int N = (int)5e5 + 7;
const int INF = (int)1e9 + 7;
const ll linf = (ll)1e18 + 1;

bool cmp(pair<int, int> a, pair<int, int> b) { 
    return a.second - a.first + 1 < b.second - b.first + 1;
}

int a[N];
ll pref[N];
map<int, int> mp;

int main() {
    int n; scanf ("%d", &n);
    vector<pair<int, int>> v;
    for (int i = 1; i <= n; ++i) { 
        scanf ("%d", a + i);
        if (i == a[i]) pref[i] = 1;
        pref[i] += pref[i - 1];
        v.pb({min(i, a[i]), max(i, a[i])});
    }
    sort(whole(v), &cmp);
    int ansL = 1, ansR = 1;
    int ans = pref[n];
    for (int i = 0; i < n; ++i) { 
        mp[v[i].first + v[i].second]++;
        int cur = pref[n] - (pref[v[i].second] - pref[(v[i].first - 1)]);
        if (cur + mp[v[i].first + v[i].second] > ans) { 
            ans = cur + mp[v[i].first + v[i].second];
            ansL = a[v[i].first], ansR = a[v[i].second];
        }
    }
    printf ("%d %d\n", ansL, ansR);
    return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

doktor.cpp: In function 'int main()':
doktor.cpp:25:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   25 |     int n; scanf ("%d", &n);
      |            ~~~~~~^~~~~~~~~~
doktor.cpp:28:15: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   28 |         scanf ("%d", a + i);
      |         ~~~~~~^~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 10 / 10
• Subtask 5: 10 / 10
• Subtask 6: 10 / 10
• Subtask 7: 10 / 10
• Subtask 8: 10 / 10
• Subtask 9: 10 / 10
• Subtask 10: 10 / 10