Submission #262891

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
262891	2020-08-13 10:35:41	FutymyClone	Labels (NOI20_labels)	C++14	100 / 100	588 ms	26872 KiB

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#include <bits/stdc++.h>
using namespace std;
const int N = 3e5 + 5;
int n, d[N], a[N];
long long f[N];
map <long long, int> mm;
void solve(){
    mm[f[0]] = 0;
    pair <int, int> temp = make_pair(-1, -1);
    for (int i = 1; i <= n - 1; i++) {
        if (mm.count(f[i] - (n - 1))) {
            temp = make_pair(mm[f[i] - (n - 1)] + 1, i + 1);
            break;
        }
        mm[f[i]] = i;
    }
    if (temp.first == -1) { return; }
    a[temp.first] = 1, a[temp.second] = n;
    for (int i = temp.first + 1; i < temp.second; i++) a[i] = d[i - 1] + a[i - 1];
    for (int i = temp.first - 1; i >= 1; i--) a[i] = a[i + 1] - d[i];
    for (int i = temp.second + 1; i <= n; i++) a[i] = a[i - 1] + d[i - 1];
    for (int i = 1; i <= n - 1; i++) if (a[i + 1] - a[i] != d[i]) return;
    for (int i = 1; i <= n; i++) if (a[i] < 1 || a[i] > n) return;
 
 
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• Subtask 1: 7 / 7
• Subtask 2: 15 / 15
• Subtask 3: 25 / 25
• Subtask 4: 18 / 18
• Subtask 5: 35 / 35