Submission #871291

#	Time	Username	Problem	Language	Result	Execution time	Memory
871291		LucaLucaM	Mutating DNA (IOI21_dna)	C++17	43 / 100	1533 ms	3924 KiB

dna

#include "dna.h"
#include <iostream>

std::string s, q;
int n;

void init(std::string a, std::string b) {
  n = (int) a.size();
  for (auto &ch : a) {
    if (ch == 'A') {
      ch = 0;
    } else if (ch == 'C') {
      ch = 1;
    } else {
      ch = 2;
    }
  }
  for (auto &ch : b) {
    if (ch == 'A') {
      ch = 0;
    } else if (ch == 'C') {
      ch = 1;
    } else {
      ch = 2;
    }
  }
  s = '$' + a, q = '$' + b;
}

int get_distance(int x, int y) {
  ++x, ++y;
  int bad = 0;
  int d[3] = {};
  for (int i = x; i <= y; i++) {
    if (s[i] != q[i]) {
      bad++;
    }
    d[s[i]]++;
    d[q[i]]--;
  }
  if (d[0] != 0 || d[1] != 0 || d[2] != 0) {
    return -1;
  }
  return (bad + 1) / 2;
}

/**
6 3
ATACAT
ACTATA
1 3
4 5
3 5

123
231

**/

Compilation message (stderr)

dna.cpp: In function 'int get_distance(int, int)':
dna.cpp:38:11: warning: array subscript has type 'char' [-Wchar-subscripts]
   38 |     d[s[i]]++;
      |           ^
dna.cpp:39:11: warning: array subscript has type 'char' [-Wchar-subscripts]
   39 |     d[q[i]]--;
      |           ^

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