Submission #499608

#	Time	Username	Problem	Language	Result	Execution time	Memory
499608		ETK	Mutating DNA (IOI21_dna)	C++17	100 / 100	59 ms	7296 KiB

dna

#include "dna.h"
#include <bits/stdc++.h>
using namespace std;
int S[100005][3][3],n;
int id(char c){
    if(c=='A')return 0;
    if(c=='T')return 1;
    return 2;
}
void init(string a,string b){
    n = a.size();
    for(int i=1;i<=n;i++){
        for(int j=0;j<3;j++)for(int k=0;k<3;k++)
            S[i][j][k] = S[i-1][j][k];
        S[i][id(a[i-1])][id(b[i-1])]++;
    }
}
int get_distance(int x,int y){
    vector <vector<int>> sum(3,vector<int>(3));
    for(int i=0;i<3;i++)for(int j=0;j<3;j++)
        sum[i][j] = S[y+1][i][j] - S[x][i][j];
    int ans = 0;
    for(int i=0;i<3;i++)for(int j=i+1;j<3;j++){
        int d = min(sum[i][j],sum[j][i]);
        ans += d, sum[i][j] -= d, sum[j][i] -= d;
    }
    if(!(sum[0][1]==sum[1][2]&&sum[1][2]==sum[2][0]))return -1;
    if(!(sum[1][0]==sum[2][1]&&sum[2][1]==sum[0][2]))return -1;
    ans += 2*(sum[0][1]+sum[1][0]);
    return ans;
}

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