Submission #440080

#	Time	Username	Problem	Language	Result	Execution time	Memory
440080		abeker	Mutating DNA (IOI21_dna)	C++17	100 / 100	77 ms	7412 KiB

dna

#include <bits/stdc++.h>
#include "dna.h"
using namespace std;
 
const int MAXN = 1e5 + 5;
const char DNA[] = "ACT";
 
int cnt[MAXN][3][3];
 
int get_id(char c) {
  return strchr(DNA, c) - DNA;
}
 
void init(string a, string b) {
  for (int i = 0; i < a.size(); i++) {
    if (i)
      memcpy(cnt[i], cnt[i - 1], sizeof cnt[i]);
    cnt[i][get_id(a[i])][get_id(b[i])]++;
  }
}
 
int get_cnt(int x, int y, int i, int j) {
  return cnt[y][i][j] - (x ? cnt[x - 1][i][j] : 0);
}
 
int get_distance(int x, int y) {
  int res = 0;
  vector <int> row(3), col(3);
  for (int i = 0; i < 3; i++)
    for (int j = 0; j < 3; j++) {
      int p = get_cnt(x, y, i, j);
      row[i] += p;
      col[j] += p;
      if (i >= j)
        continue;
      int q = get_cnt(x, y, j, i);
      if (p < q)
        swap(p, q);
      res += 2 * p + q;
    }
  for (int i = 0; i < 3; i++)
    if (row[i] != col[i])
      return -1;
  return (res + 2) / 3;
}

Compilation message (stderr)

dna.cpp: In function 'void init(std::string, std::string)':
dna.cpp:15:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   15 |   for (int i = 0; i < a.size(); i++) {
      |                   ~~^~~~~~~~~~

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