Submission #116835

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
116835	2019-06-14 02:14:45	minhcool	Doktor (COCI17_doktor)	C++17	100 / 100	270 ms	46556 KiB

doktor

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#include<bits/stdc++.h>
using namespace std;
#define int long long
int n, a[500001], pre[500001], mx, ans1, ans2;
vector<int> change[500001];
vector<int> change2[500001];
signed main(){
    ios_base::sync_with_stdio(0);
    cin >> n;
    for(int i = 1; i <= n; i++){
        cin >> a[i];
        pre[i] = pre[i - 1];
        if(a[i] == i) pre[i]++;
        if((a[i] + i) % 2 == 0) change[(a[i] + i) / 2].push_back(abs(a[i] - i) / 2);
        else change2[(a[i] + i) / 2].push_back(abs(a[i] - i) / 2);
    }
    ans1 = ans2 = a[1];
    for(int i = 1; i <= n; i++){
        if(!change[i].size()) continue;
        sort(change[i].begin(), change[i].end());
        for(int j = change[i].size() - 1; j >= 0; j--){
            if(mx < (j + 1 - pre[change[i][j] + i] + pre[i - change[i][j] - 1])){
                mx = j + 1 - pre[change[i][j] + i] + pre[i - change[i][j] - 1];
                ans1 = a[i - change[i][j]];
                ans2 = a[i + change[i][j]];
            }
        }
    }
 
 
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• 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