Submission #581641

#	Time	Username	Problem	Language	Result	Execution time	Memory
581641		penguinhacker	Mutating DNA (IOI21_dna)	C++17	56 / 100	33 ms	5404 KiB

dna

#include <bits/stdc++.h>
using namespace std;

#define ll long long
#define ar array

const int mxN=1e5;
int p[mxN+1][3], bad[mxN+1];

void init(string a, string b) {
	int n=a.size();
	for (int i=0; i<n; ++i) {
		p[i+1][0]=p[i][0]+(a[i]=='A')-(b[i]=='A');
		p[i+1][1]=p[i][1]+(a[i]=='T')-(b[i]=='T');
		p[i+1][2]=p[i][2]+(a[i]=='C')-(b[i]=='C');
		bad[i+1]=bad[i]+(a[i]!=b[i]);
	}
}

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

/*int main() {
	ios::sync_with_stdio(0);
	cin.tie(0);
	init("ATACAT", "ACTATA");
	cout << get_distance(1, 3) << " " << get_distance(4, 5) << " " << get_distance(3, 5);
	return 0;
}*/

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