#include <bits/stdc++.h>
using namespace std;
const int inf = 1e8;
const int maxn = 7e4 + 10;
const int alpha = 10;
string s;
int n;
int nxt[alpha][maxn];
int opt[maxn];
map <pair <int, int>, int> mem;
int cnt[maxn];
int dp(int now, int done) {
int jump = opt[done];
if(jump == n) return 0;
if(mem.find(make_pair(now, done)) != mem.end()) {
return mem[make_pair(now, done)];
}
int ans = inf;
for(int i = 0; i < alpha; i++) {
if(i != 'e' - 'a' && nxt[i][now] < n) {
int idx = nxt[i][now];
if(idx < jump) {
ans = min(ans, 2 + dp(idx, max(done, idx)));
} else {
ans = min(ans, 2 + dp(jump, idx) + cnt[idx] - cnt[jump]);
}
}
}
return mem[make_pair(now, done)] = ans;
}
int main() {
cin >> n >> s;
vector <int> aux (alpha, n);
for(int i = n - 1; i >= 0; i--) {
for(int j = 0; j < alpha; j++) {
nxt[j][i] = aux[j];
}
aux[s[i] - 'a'] = i;
}
int var = n;
for(int i = n - 1; i >= 0; i--) {
opt[i] = var;
if(i > 0 && s[i - 1] == 'e' && s[i] != 'e') {
var = i;
}
}
int total = 0;
for(int i = 0; i < n; i++) {
total += (s[i] != 'e');
cnt[i] = total;
}
int ans = 2 * count(s.begin(), s.end(), 'e');
cout << ans + dp(0, 0) << endl;
}
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
6 ms |
512 KB |
Output is correct |
| 2 |
Incorrect |
5 ms |
512 KB |
Output isn't correct |
| 3 |
Incorrect |
6 ms |
512 KB |
Output isn't correct |
| 4 |
Correct |
6 ms |
512 KB |
Output is correct |
| 5 |
Correct |
6 ms |
512 KB |
Output is correct |
| 6 |
Correct |
7 ms |
512 KB |
Output is correct |
| 7 |
Correct |
7 ms |
512 KB |
Output is correct |
| 8 |
Correct |
4 ms |
384 KB |
Output is correct |
| 9 |
Correct |
4 ms |
384 KB |
Output is correct |
| 10 |
Correct |
4 ms |
384 KB |
Output is correct |
| 11 |
Correct |
4 ms |
384 KB |
Output is correct |
| 12 |
Correct |
4 ms |
384 KB |
Output is correct |
| 13 |
Correct |
6 ms |
512 KB |
Output is correct |
| 14 |
Incorrect |
5 ms |
512 KB |
Output isn't correct |
| 15 |
Incorrect |
5 ms |
384 KB |
Output isn't correct |
| 16 |
Incorrect |
6 ms |
512 KB |
Output isn't correct |
| 17 |
Correct |
7 ms |
512 KB |
Output is correct |
| 18 |
Correct |
6 ms |
512 KB |
Output is correct |
| 19 |
Incorrect |
5 ms |
512 KB |
Output isn't correct |
| 20 |
Correct |
6 ms |
512 KB |
Output is correct |
| 21 |
Correct |
6 ms |
512 KB |
Output is correct |
| 22 |
Correct |
6 ms |
512 KB |
Output is correct |
| 23 |
Correct |
6 ms |
512 KB |
Output is correct |
| 24 |
Correct |
6 ms |
512 KB |
Output is correct |
| 25 |
Correct |
7 ms |
512 KB |
Output is correct |
| 26 |
Correct |
7 ms |
512 KB |
Output is correct |
| 27 |
Correct |
7 ms |
512 KB |
Output is correct |
| 28 |
Correct |
7 ms |
512 KB |
Output is correct |
| 29 |
Incorrect |
7 ms |
512 KB |
Output isn't correct |
| 30 |
Incorrect |
6 ms |
512 KB |
Output isn't correct |
| 31 |
Correct |
7 ms |
512 KB |
Output is correct |
| 32 |
Incorrect |
7 ms |
512 KB |
Output isn't correct |
| 33 |
Correct |
6 ms |
512 KB |
Output is correct |
| 34 |
Correct |
7 ms |
512 KB |
Output is correct |
| 35 |
Correct |
7 ms |
512 KB |
Output is correct |
| 36 |
Correct |
7 ms |
512 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
30 ms |
1664 KB |
Output is correct |
| 2 |
Correct |
39 ms |
2176 KB |
Output is correct |
| 3 |
Correct |
26 ms |
1272 KB |
Output is correct |
| 4 |
Correct |
28 ms |
1664 KB |
Output is correct |
| 5 |
Incorrect |
40 ms |
2168 KB |
Output isn't correct |
| 6 |
Incorrect |
37 ms |
2432 KB |
Output isn't correct |
| 7 |
Incorrect |
30 ms |
1784 KB |
Output isn't correct |
| 8 |
Incorrect |
33 ms |
1916 KB |
Output isn't correct |
| 9 |
Correct |
39 ms |
2176 KB |
Output is correct |
| 10 |
Incorrect |
35 ms |
2040 KB |
Output isn't correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Incorrect |
490 ms |
23548 KB |
Output isn't correct |
| 2 |
Incorrect |
347 ms |
19960 KB |
Output isn't correct |
| 3 |
Incorrect |
471 ms |
23800 KB |
Output isn't correct |
| 4 |
Incorrect |
361 ms |
22392 KB |
Output isn't correct |
| 5 |
Incorrect |
571 ms |
27360 KB |
Output isn't correct |
| 6 |
Incorrect |
359 ms |
16844 KB |
Output isn't correct |
| 7 |
Incorrect |
562 ms |
24952 KB |
Output isn't correct |
| 8 |
Incorrect |
617 ms |
27128 KB |
Output isn't correct |
| 9 |
Incorrect |
452 ms |
21136 KB |
Output isn't correct |
| 10 |
Incorrect |
471 ms |
20728 KB |
Output isn't correct |
| 11 |
Incorrect |
357 ms |
22384 KB |
Output isn't correct |
| 12 |
Incorrect |
573 ms |
27640 KB |
Output isn't correct |
| 13 |
Incorrect |
530 ms |
26492 KB |
Output isn't correct |
| 14 |
Incorrect |
405 ms |
23160 KB |
Output isn't correct |
| 15 |
Incorrect |
625 ms |
26744 KB |
Output isn't correct |
| 16 |
Incorrect |
316 ms |
20984 KB |
Output isn't correct |
| 17 |
Incorrect |
495 ms |
23544 KB |
Output isn't correct |
| 18 |
Incorrect |
470 ms |
23672 KB |
Output isn't correct |
| 19 |
Incorrect |
347 ms |
19960 KB |
Output isn't correct |
| 20 |
Incorrect |
533 ms |
23140 KB |
Output isn't correct |
