Submission #823674

#	Time	Username	Problem	Language	Result	Execution time	Memory
823674		SoulKnight	Mutating DNA (IOI21_dna)	C++17	0 / 100	99 ms	4948 KiB

dna

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

#define ll long long
#define ln '\n'

const int N = 1e5 + 5;

int same[N];
int n;
vector<int> wa[3], wb[3];

void init(std::string a, std::string b) {
	n = a.size();
	for (int i = 0; i < n; i++) same[i] = (a[i] == b[i]);
	for (int i = 0; i < n; i++) same[i] += same[i-1];

	for (int i = 0; i < n; i++){
		if (a[i] == 'A') wa[0].push_back(i);
		else if (a[i] == 'C') wa[1].push_back(i);
		else wa[2].push_back(i);
	}

	for (int i = 0; i < n; i++){
		if (b[i] == 'A') wb[0].push_back(i);
		else if (b[i] == 'C') wb[1].push_back(i);
		else wb[2].push_back(i);
	}
}

int get_distance(int x, int y) {
	bool ok = true;
	for (int i = 0; i < 3; i++){
		int c1 = upper_bound(wa[i].begin(), wa[i].end(), y) - lower_bound(wa[i].begin(), wa[i].end(), x);
		int c2 = upper_bound(wb[i].begin(), wb[i].end(), y) - lower_bound(wb[i].begin(), wb[i].end(), x);

		if (c1 != c2) {ok = false; break;}
	}

	if (!ok) return -1;

	return y-x- (same[y] - ((x-1 < 0)? 0: same[x-1]));



}

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