Submission #1195739

#	Time	Username	Problem	Language	Result	Execution time	Memory
1195739		Nonoze	Mutating DNA (IOI21_dna)	C++20	100 / 100	99 ms	33868 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;
}

int n;
vector<vector<int>> prefa, prefb;
vector<vector<vector<int>>> diffs;
vector<int> diff;
string a, b;

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

int get_distance(int x, int y) {
	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;
	vector<vector<int>> act={
		{diffs[y+1][0][0]-diffs[x][0][0], diffs[y+1][0][1]-diffs[x][0][1], diffs[y+1][0][2]-diffs[x][0][2]},
		{diffs[y+1][1][0]-diffs[x][1][0], diffs[y+1][1][1]-diffs[x][1][1], diffs[y+1][1][2]-diffs[x][1][2]},
		{diffs[y+1][2][0]-diffs[x][2][0], diffs[y+1][2][1]-diffs[x][2][1], diffs[y+1][2][2]-diffs[x][2][2]}
	};
	int ans=min(act[0][1], act[1][0])+min(act[0][2], act[2][0])+min(act[1][2], act[2][1]);
	assert(abs(act[0][1]-act[1][0])==abs(act[0][2]-act[2][0]) && abs(act[0][1]-act[1][0])==abs(act[1][2]-act[2][1]));
	return ans+abs(act[0][1]-act[1][0])*2;
}

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