oj.uz

답안 #1082126

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
1082126 2024-08-30T17:48:00 Z juicy Palinilap (COI16_palinilap) C++17
54 / 100
 39 ms 24648 KB 
#include <bits/stdc++.h>
 
using namespace std;
 
#ifdef LOCAL
#include "debug.h"
#else
#define debug(...) 42
#endif
 
using ull = unsigned long long;
 
const int N = 1e5 + 5, B = 29;
 
int n;
int cnt[N];
long long f[N];
array<long long, 26> c[N];
string s;
ull h[N], rh[N], pw[N];
 
ull qry(int l, int r, ull *h) {
  return h[r] - h[l - 1] * pw[r - l + 1];
}
 
int find(int s, int e) {
  if (s < 1 || e > n) {
    return 0;
  }
  int l = 0, r = min(s, n - e + 1), res = 0;
  while (l <= r) {
    int m = (l + r) / 2;
    if (qry(s - m + 1, s, h) == qry(n - e - m + 2, n - e + 1, rh)) {
      res = m;
      l = m + 1;
    } else {
      r = m - 1;
    }
  }
  return res;
}
 
template<class T>
void upd(int s, int e, int x, T *f) {
  f[s] += x;
  f[e + 1] -= x; 
}
 
signed main() {
  ios::sync_with_stdio(false); cin.tie(nullptr);
 
  cin >> s;
  n = s.size();
  pw[0] = 1;
  for (int i = 0; i < n; ++i) {
    pw[i + 1] = pw[i] * B;
    h[i + 1] = h[i] * B + s[i] - 'a' + 1;
  }
  for (int i = n - 1; i >= 0; --i) {
    rh[i + 1] = rh[i + 2] * B + s[i] - 'a' + 1;
  }
  reverse(rh + 1, rh + n + 1);
  long long res = 0;
  for (int i = 1; i < n; ++i) {
    int l = find(i, i + 1);
    res += l;
    int L = i - l + 1, R = i + l;
    if (l > 0) {
      upd(i + 1, i + l, 1, cnt);
      upd(i + 1, i + l, -R - 1, f);
      upd(i - l + 1, i, -1, cnt);
      upd(i - l + 1, i, L - 1, f);
    }
    if (1 < L && R < n) {
      int l = find(L - 2, R + 2);
      c[L - 1][s[R] - 'a'] += l + 1;
      c[R + 1][s[L - 2] - 'a'] += l + 1;
    }
  }
  for (int i = 1; i <= n; ++i) {
    int l = find(i - 1, i + 1) + 1;
    res += l;
    int L = i - l + 1, R = i + l - 1;
    if (l > 1) {
      upd(L, i - 1, -1, cnt);
      upd(L, i - 1, L - 1, f);
      upd(i + 1, R, 1, cnt);
      upd(i + 1, R, -R - 1, f);
    }
    if (1 < L && R < n) {
      int l = find(L - 2, R + 2);
      c[L - 1][s[R] - 'a'] += l + 1;
      c[R + 1][s[L - 2] - 'a'] += l + 1;
    }
  }
  long long ma = 0;
  for (int i = 1; i <= n; ++i) {
    cnt[i] += cnt[i - 1];
    f[i] += f[i - 1];
    long long delta = (long long) cnt[i] * i + f[i];
    for (int j = 0; j < 26; ++j) {
      ma = max(ma, delta + c[i][j]);
    }
  }
  cout << res + ma;
  return 0;
}

Subtask #1
17.0 / 17.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 600 KB Output is correct
2 Correct 1 ms 856 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct

Subtask #2
37.0 / 37.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 1628 KB Output is correct
2 Correct 1 ms 1628 KB Output is correct
3 Correct 2 ms 1628 KB Output is correct
4 Correct 1 ms 988 KB Output is correct
5 Correct 2 ms 1372 KB Output is correct
6 Correct 1 ms 1628 KB Output is correct
7 Correct 2 ms 1628 KB Output is correct

Subtask #3
0 / 46.0

# 결과 실행 시간 메모리 Grader output
1 Correct 39 ms 24648 KB Output is correct
2 Correct 26 ms 24416 KB Output is correct
3 Correct 27 ms 24532 KB Output is correct
4 Correct 32 ms 24412 KB Output is correct
5 Correct 34 ms 24408 KB Output is correct
6 Correct 35 ms 24412 KB Output is correct
7 Correct 35 ms 24636 KB Output is correct
8 Correct 16 ms 4188 KB Output is correct
9 Correct 33 ms 24408 KB Output is correct
10 Correct 38 ms 24404 KB Output is correct
11 Correct 25 ms 24548 KB Output is correct
12 Correct 33 ms 24408 KB Output is correct
13 Correct 32 ms 24412 KB Output is correct
14 Correct 35 ms 24412 KB Output is correct
15 Correct 35 ms 24412 KB Output is correct
16 Correct 29 ms 24412 KB Output is correct
17 Correct 28 ms 24412 KB Output is correct
18 Incorrect 30 ms 24544 KB Output isn't correct
19 Halted 0 ms 0 KB -