Submission #1155971

#	Time	Username	Problem	Language	Result	Execution time	Memory
1155971		equation_tracker	Mutating DNA (IOI21_dna)	C++20	0 / 100	21 ms	6916 KiB

dna

#include "dna.h"
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
vector<ll> pre_ta, pre_at, pre_ct, pre_tc, pre_ac, pre_ca;
void init(std::string a, std::string b)
{
  ll n = a.size();
  pre_ca.resize(n + 1, 0);
  pre_ac.resize(n + 1, 0);
  pre_at.resize(n + 1, 0);
  pre_ta.resize(n + 1, 0);
  pre_tc.resize(n + 1, 0);
  pre_ct.resize(n + 1, 0);
  for (ll i = 1; i <= n; i++)
  {
    if (a[i] == 'C' && b[i] == 'A')
      pre_ca[i]++;
    else if (a[i] == 'A' && b[i] == 'C')
      pre_ac[i]++;
    else if (a[i] == 'A' && b[i] == 'T')
      pre_at[i]++;
    else if (a[i] == 'T' && b[i] == 'A')
      pre_ta[i]++;
    else if (a[i] == 'T' && b[i] == 'C')
      pre_tc[i]++;
    else if (a[i] == 'C' && b[i] == 'T')
      pre_ct[i]++;
  }
  for (ll i = 1; i <= n; i++)
  {
    pre_ca[i] += pre_ca[i - 1];
    pre_ac[i] += pre_ac[i - 1];
    pre_at[i] += pre_at[i - 1];
    pre_ta[i] += pre_ta[i - 1];
    pre_tc[i] += pre_tc[i - 1];
    pre_ct[i] += pre_ct[i - 1];
  }
}
int get_distance(int x, int y)
{
  ll ca = pre_ca[y] - pre_ca[x - 1];
  ll ac = pre_ac[y] - pre_ac[x - 1];
  ll at = pre_at[y] - pre_at[x - 1];
  ll ta = pre_ta[y] - pre_ta[x - 1];
  ll tc = pre_tc[y] - pre_tc[x - 1];
  ll ct = pre_ct[y] - pre_ct[x - 1];
  ll AT = min(at, ta);
  ll AC = min(ac, ca);
  ll TC = min(tc, ct);
  if (max(at, ta) - AT != max(ac, ca) - AC || max(ct, tc) - TC != max(ac,ca) - AC) return -1;
  return 2 * max(at, ta) - AT + AC + TC;
}

• Subtask 1: 0 / 21
• Subtask 2: 0 / 22
• Subtask 3: 0 / 13
• Subtask 4: 0 / 28
• Subtask 5: 0 / 16