Submission #483559

#	Time	Username	Problem	Language	Result	Execution time	Memory
483559		M_W	Mutating DNA (IOI21_dna)	C++17	100 / 100	40 ms	6212 KiB

dna

#include <bits/stdc++.h>
using namespace std;
int qs[100001][6]; // AT, TA, AC, CA, CT, TC
void init(string a, string b){
	int len = a.size();
	for(int i = 1; i <= len; i++){
		for(int j = 0; j < 6; j++) qs[i][j] = qs[i - 1][j];
		if(a[i - 1] == 'A'){
			if(b[i - 1] == 'C') qs[i][2]++;
			else if(b[i - 1] == 'T') qs[i][0]++;
		}
		else if(a[i - 1] == 'T'){
			if(b[i - 1] == 'A') qs[i][1]++;
			else if(b[i - 1] == 'C') qs[i][5]++;
		}
		else{
			if(b[i - 1] == 'A') qs[i][3]++;
			else if(b[i - 1] == 'T') qs[i][4]++; 
		}
	}
}

int get_distance(int a, int b){
	a++; b++;
	int AT = qs[b][0] - qs[a - 1][0];
	int TA = qs[b][1] - qs[a - 1][1];
	int AC = qs[b][2] - qs[a - 1][2];
	int CA = qs[b][3] - qs[a - 1][3];
	int CT = qs[b][4] - qs[a - 1][4];
	int TC = qs[b][5] - qs[a - 1][5];
	
	int A1 = AT + AC, C1 = CA + CT, T1 = TA + TC;
	int A2 = TA + CA, C2 = AC + TC, T2 = AT + CT;
	
	if(A1 != A2 || C1 != C2 || T1 != T2) return -1;
	int ATp = min(AT, TA), ACp = min(AC, CA), TCp = min(TC, CT);
	int ret = ATp + ACp + TCp;
	AT -= ATp; TA -= ATp;
	AC -= ACp; CA -= ACp;
	TC -= TCp; CT -= TCp;
	
	ret += ((AC + CT + TA) / 3) * 2;
	ret += ((CA + AT + TC) / 3) * 2;
	return ret;
}

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