Submission #565409

#	Time	Username	Problem	Language	Result	Execution time	Memory
565409		TomkeMonke	Mutating DNA (IOI21_dna)	C++17	100 / 100	60 ms	6868 KiB

dna

#include <bits/stdc++.h>
#include "dna.h"

using namespace std;

const int MAXN = 1e5 + 7;

int word1[MAXN];
int word2[MAXN];

int pref[MAXN][3][3];

void init(string a, string b){
	
	int n = a.size();
	
	for(int i = 0; i < n; i++){
		
		if(a[i] == 'A')
			word1[i + 1] = 0;
		
		if(a[i] == 'T')
			word1[i + 1] = 1;
		
		if(a[i] == 'C')
			word1[i + 1] = 2;
			
		if(b[i] == 'A')
			word2[i + 1] = 0;
		
		if(b[i] == 'T')
			word2[i + 1] = 1;
		
		if(b[i] == 'C')
			word2[i + 1] = 2;
	}
	
	for(int i = 1; i <= n; i++){
		
		for(int c1 = 0; c1 < 3; c1++){
			
			for(int c2 = 0; c2 < 3; c2++){
				
				if((word1[i] == c1) && (word2[i] == c2))
					pref[i][c1][c2] = pref[i - 1][c1][c2] + 1;
				
				else 
					pref[i][c1][c2] = pref[i - 1][c1][c2] + 0;
			}
		}
	}
}


int get_distance(int x, int y){
	
	x = x + 1;
	y = y + 1;
	
	// 0 - A, 1 - T, 2 - C
	// 0 -> 1 (zamiana A na T)
	
	int AT = pref[y][0][1] - pref[x - 1][0][1];
	int TA = pref[y][1][0] - pref[x - 1][1][0];
	
	int TC = pref[y][1][2] - pref[x - 1][1][2];
	int CT = pref[y][2][1] - pref[x - 1][2][1];
	
	int CA = pref[y][2][0] - pref[x - 1][2][0];
	int AC = pref[y][0][2] - pref[x - 1][0][2];
	
	if((AT + AC == TA + CA) && (TA + TC == AT + CT)){
		
		int ans = min(AT, TA) + min(TC, CT) + min(CA, AC);
		ans += 2 * abs(AT - TA);
		
		return ans;
	}
	
	else return -1;
}

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