Submission #647190

#	Time	Username	Problem	Language	Result	Execution time	Memory
647190		tvladm2009	Martian DNA (BOI18_dna)	C++14	100 / 100	45 ms	4556 KiB

dna

#include <bits/stdc++.h>

using ll = long long;

int const nmax = 200000;

int v[1 + nmax], mn[1 + nmax], fr[1 + nmax];

int main() {
  std::ios_base::sync_with_stdio(0);
  std::cin.tie(0);

  int n, k, r;
  std::cin >> n >> k >> r;
  for(int i = 1;i <= n; i++)
    std::cin >> v[i];
  for(int i = 1;i <= r; i++) {
    int x, y;
    std::cin >> x >> y;
    mn[x] = y;
  }

  int j = 1, cnt = 0;
  while(j <= n && cnt != r) {
    fr[v[j]]++;
    if(fr[v[j]] == mn[v[j]])
      cnt++;
    j++;
  }
  if(cnt != r) {
    std::cout << "impossible";
    return 0;
  }
  int ans = j - 1;
  for(int i = 2;i <= n; i++) {
    fr[v[i - 1]]--;
    if(fr[v[i - 1]] < mn[v[i - 1]])
      cnt--;
    while(j <= n && cnt != r) {
      fr[v[j]]++;
      if(fr[v[j]] == mn[v[j]])
        cnt++;
      j++;
    }
    if(cnt != r)
      break;
    ans = std::min(ans, j - i);
  }
  std::cout << ans;
  return 0;
}

• Subtask 1: 16 / 16
• Subtask 2: 24 / 24
• Subtask 3: 28 / 28
• Subtask 4: 32 / 32