Submission #1195695

#	Time	Username	Problem	Language	Result	Execution time	Memory
1195695		Nonoze	Mutating DNA (IOI21_dna)	C++20	56 / 100	38 ms	19532 KiB

dna

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

int is(char c) {
	if (c=='A') return 0;
	else if (c=='C') return 1;
	return 2;
}

vector<vector<int>> prefa, prefb, diffa;
vector<int> diff;

void init(string a, string b) {
	prefa.push_back({0, 0, 0}), prefb.push_back({0, 0, 0}), diff.push_back(0), diffa.push_back({0, 0, 0});
	for (int i=0; i<(int)a.size(); i++) {
		prefa.push_back(prefa.back()), prefb.push_back(prefb.back()), diff.push_back(diff.back()), diffa.push_back(diffa.back());
		prefa.back()[is(a[i])]++, prefb.back()[is(b[i])]++;
		if (a[i]!=b[i]) {
			diff.back()++;
			diffa.back()[is(a[i])]++;
		}
	}
}

int get_distance(int x, int y) {
	int nba=diffa[y+1][0]-diffa[x][0], nbb=diffa[y+1][1]-diffa[x][1], nbc=diffa[y+1][2]-diffa[x][2];
	if (prefa[y+1][0]-prefa[x][0]!=prefb[y+1][0]-prefb[x][0] || prefa[y+1][1]-prefa[x][1]!=prefb[y+1][1]-prefb[x][1] || prefa[y+1][2]-prefa[x][2]!=prefb[y+1][2]-prefb[x][2]) return -1;
	return max({nba, nbb, nbc, (diff[y+1]-diff[x]+1)/2});
}

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