답안 #32085 :: oj.uz

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
32085	2017-09-24T14:08:20 Z	cheater2k	세 명의 친구들 (BOI14_friends)	C++14	100 / 100	239 ms	46424 KB

friends

#include <bits/stdc++.h>
using namespace std;

void out() { printf("NOT POSSIBLE\n"); exit(0); }

const int N = 2000005;
const int md = 1e9 + 123;
const int BASE = 27;

string s;
int n;
int ans, pos;
int H[N];
int pw[N];
vector < pair<int,int> > A;

int get(int l, int r) {
	if (l > r) return 0;
	int res = (H[r] - (1LL * H[l-1] * pw[r - l + 1] % md)) % md;
	if (res < 0) res += md; return res;
}

int main() {
	ios_base::sync_with_stdio(false); cin.tie(0);
	cin >> n >> s; s = ' ' + s;
	if (n % 2 == 0) out();
	pw[0] = 1; for (int i = 1; i < N; ++i) pw[i] = 1LL * pw[i-1] * BASE % md;
	for (int i = 1; i <= n; ++i) H[i] = (1LL * H[i-1] * BASE + s[i] - 'A') % md;

	int sz = n / 2;

	for (int i = 1; i <= n; ++i) {
		int H0 = 0, H1 = 0;
		if (i <= sz + 1) {
			H0 = (1LL * get(1, i - 1) * pw[sz - i + 1] % md + get(i + 1, sz + 1)) % md;
			H1 = get(sz + 2, n);
		} else {
			H0 = get(1, sz);
			H1 = (1LL * get(sz + 1, i - 1) * pw[sz * 2 - i + 1] % md + get(i + 1, n)) % md;
		}
		if (H0 == H1) A.push_back(make_pair(H0, i));
	}
	sort(A.begin(), A.end());
	if (A.empty()) out();
	else {
		for (int i = 0; i < (int)A.size(); ++i) if (A[i].first != A[0].first) return printf("NOT UNIQUE\n"), 0;
		int pos = A[0].second;

		if (pos <= sz + 1) for (int i = sz + 2; i <= n; ++i) printf("%c", s[i]);
		else for (int i = 1; i <= sz; ++i) printf("%c", s[i]);
		printf("\n");
	}
}

Subtask #1
35.0 / 35.0

#	결과	실행 시간	메모리	Grader output
1	Correct	16 ms	17804 KB	Output is correct
2	Correct	13 ms	17804 KB	Output is correct
3	Correct	13 ms	17804 KB	Output is correct
4	Correct	16 ms	17804 KB	Output is correct
5	Correct	13 ms	17804 KB	Output is correct
6	Correct	13 ms	17804 KB	Output is correct
7	Correct	16 ms	17804 KB	Output is correct
8	Correct	6 ms	17804 KB	Output is correct
9	Correct	16 ms	17804 KB	Output is correct
10	Correct	16 ms	17804 KB	Output is correct
11	Correct	13 ms	17804 KB	Output is correct
12	Correct	16 ms	17804 KB	Output is correct
13	Correct	16 ms	17804 KB	Output is correct
14	Correct	9 ms	17804 KB	Output is correct
15	Correct	13 ms	17804 KB	Output is correct
16	Correct	13 ms	17804 KB	Output is correct
17	Correct	16 ms	17804 KB	Output is correct
18	Correct	13 ms	17804 KB	Output is correct
19	Correct	16 ms	17804 KB	Output is correct
20	Correct	16 ms	17804 KB	Output is correct
21	Correct	9 ms	17804 KB	Output is correct
22	Correct	16 ms	17804 KB	Output is correct
23	Correct	13 ms	17804 KB	Output is correct
24	Correct	0 ms	17804 KB	Output is correct
25	Correct	0 ms	17804 KB	Output is correct
26	Correct	0 ms	17804 KB	Output is correct
27	Correct	13 ms	17804 KB	Output is correct
28	Correct	9 ms	17804 KB	Output is correct
29	Correct	6 ms	17804 KB	Output is correct
30	Correct	13 ms	17804 KB	Output is correct
31	Correct	9 ms	17804 KB	Output is correct
32	Correct	6 ms	17804 KB	Output is correct
33	Correct	16 ms	17804 KB	Output is correct
34	Correct	13 ms	17804 KB	Output is correct
35	Correct	13 ms	17804 KB	Output is correct
36	Correct	9 ms	17804 KB	Output is correct
37	Correct	6 ms	17804 KB	Output is correct
38	Correct	13 ms	17804 KB	Output is correct
39	Correct	16 ms	17804 KB	Output is correct
40	Correct	9 ms	17804 KB	Output is correct
41	Correct	16 ms	17804 KB	Output is correct
42	Correct	13 ms	17804 KB	Output is correct
43	Correct	9 ms	17804 KB	Output is correct
44	Correct	13 ms	17804 KB	Output is correct
45	Correct	16 ms	17804 KB	Output is correct
46	Correct	13 ms	17804 KB	Output is correct
47	Correct	9 ms	17804 KB	Output is correct
48	Correct	9 ms	17804 KB	Output is correct
49	Correct	0 ms	17804 KB	Output is correct
50	Correct	13 ms	17804 KB	Output is correct
51	Correct	16 ms	17804 KB	Output is correct
52	Correct	13 ms	17804 KB	Output is correct
53	Correct	16 ms	17804 KB	Output is correct
54	Correct	13 ms	17804 KB	Output is correct

Subtask #2
65.0 / 65.0

#	결과	실행 시간	메모리	Grader output
1	Correct	149 ms	21840 KB	Output is correct
2	Correct	136 ms	21840 KB	Output is correct
3	Correct	156 ms	21840 KB	Output is correct
4	Correct	143 ms	21840 KB	Output is correct
5	Correct	143 ms	21840 KB	Output is correct
6	Correct	0 ms	21840 KB	Output is correct
7	Correct	239 ms	46424 KB	Output is correct
8	Correct	89 ms	21644 KB	Output is correct
9	Correct	126 ms	21644 KB	Output is correct
10	Correct	129 ms	21644 KB	Output is correct
11	Correct	73 ms	21512 KB	Output is correct
12	Correct	6 ms	17804 KB	Output is correct
13	Correct	13 ms	17804 KB	Output is correct
14	Correct	16 ms	17804 KB	Output is correct
15	Correct	6 ms	17804 KB	Output is correct
16	Correct	13 ms	17804 KB	Output is correct
17	Correct	13 ms	17804 KB	Output is correct
18	Correct	9 ms	17804 KB	Output is correct
19	Correct	16 ms	17804 KB	Output is correct
20	Correct	16 ms	17804 KB	Output is correct
21	Correct	13 ms	17804 KB	Output is correct
22	Correct	16 ms	17804 KB	Output is correct
23	Correct	13 ms	17804 KB	Output is correct
24	Correct	16 ms	17804 KB	Output is correct
25	Correct	16 ms	17804 KB	Output is correct
26	Correct	9 ms	17804 KB	Output is correct
27	Correct	13 ms	17804 KB	Output is correct
28	Correct	13 ms	17804 KB	Output is correct
29	Correct	6 ms	17804 KB	Output is correct
30	Correct	16 ms	17804 KB	Output is correct
31	Correct	9 ms	17804 KB	Output is correct
32	Correct	9 ms	17804 KB	Output is correct
33	Correct	9 ms	17804 KB	Output is correct
34	Correct	13 ms	17804 KB	Output is correct
35	Correct	0 ms	17804 KB	Output is correct
36	Correct	0 ms	17804 KB	Output is correct
37	Correct	0 ms	17804 KB	Output is correct
38	Correct	16 ms	17804 KB	Output is correct
39	Correct	9 ms	17804 KB	Output is correct
40	Correct	13 ms	17804 KB	Output is correct
41	Correct	13 ms	17804 KB	Output is correct
42	Correct	6 ms	17804 KB	Output is correct
43	Correct	9 ms	17804 KB	Output is correct
44	Correct	13 ms	17804 KB	Output is correct
45	Correct	13 ms	17804 KB	Output is correct
46	Correct	16 ms	17804 KB	Output is correct
47	Correct	13 ms	17804 KB	Output is correct
48	Correct	13 ms	17804 KB	Output is correct
49	Correct	16 ms	17804 KB	Output is correct
50	Correct	13 ms	17804 KB	Output is correct
51	Correct	6 ms	17804 KB	Output is correct
52	Correct	16 ms	17804 KB	Output is correct
53	Correct	13 ms	17804 KB	Output is correct
54	Correct	16 ms	17804 KB	Output is correct

답안 #32085

Compilation message

Subtask #1 35.0 / 35.0

Subtask #2 65.0 / 65.0

Subtask #1
35.0 / 35.0

Subtask #2
65.0 / 65.0