Submission #437077

#	Time	Username	Problem	Language	Result	Execution time	Memory
437077		T0p_	Mutating DNA (IOI21_dna)	C++17	56 / 100	52 ms	5256 KiB

dna

#include "dna.h"
#include <bits/stdc++.h>
using namespace std;
 
int n;
int cnt[2][3][100100], ans[100100];
map<char, int> mp;
 
void init(string a, string b)
{
	n = a.length();
	mp['A'] = 0;
	mp['C'] = 1;
	mp['T'] = 2;
	cnt[0][mp[a[0]]][1]++;
	cnt[1][mp[b[0]]][1]++;
	ans[1] = (a[0] == b[0]) ? 0 : 1;
	for(int i=2 ; i<=n ; i++)
	{
		cnt[0][mp[a[i-1]]][i]++;
		cnt[1][mp[b[i-1]]][i]++;
		for(int j=0 ; j<3 ; j++)
		{
			cnt[0][j][i] += cnt[0][j][i-1];
			cnt[1][j][i] += cnt[1][j][i-1];
		}
		ans[i] = ans[i-1] + ((a[i-1] == b[i-1]) ? 0 : 1);
	}
}
 
int get_distance(int x, int y)
{
	x++, y++;
	for(int j=0 ; j<3 ; j++) if(cnt[0][j][y]-cnt[0][j][x-1] != cnt[1][j][y]-cnt[1][j][x-1]) return -1;
	int ret = 0, dif = ans[y] - ans[x-1];
	if(dif%2)
	{
		ret = 2;
		dif -= 3;
	}
	ret += dif/2;
	return ret;
}

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