Submission #549956

#	Time	Username	Problem	Language	Result	Execution time	Memory
549956		CyberSleeper	Mutating DNA (IOI21_dna)	C++17	100 / 100	43 ms	10176 KiB

dna

#include "dna.h"
#include <bits/stdc++.h>
using namespace std;
char gen[]={'A', 'T', 'C'};
int N, diff[100007], pref[3][3][100007], prefA[3][100007], prefB[3][100007];
int getD(int x){
    if(x>=0)
        return diff[x];
    return 0;
}
int getP(int x, int y, int z){
    if(z>=0)
        return pref[x][y][z];
    return 0;
}
int getA(int x, int y){
    if(y>=0)
        return prefA[x][y];
    return 0;
}
int getB(int x, int y){
    if(y>=0)
        return prefB[x][y];
    return 0;
}
void init(std::string a, std::string b) {
    N=a.size();
    for(int i=0; i<N; i++){
        diff[i]=(a[i]!=b[i])+getD(i-1);
        for(int j=0; j<3; j++){
            prefA[j][i]=(a[i]==gen[j])+getA(j, i-1);
            prefB[j][i]=(b[i]==gen[j])+getB(j, i-1);
            for(int k=0; k<3; k++){
                pref[j][k][i]=((a[i]==gen[j])&&(b[i]==gen[k]))+getP(j, k, i-1);
            }
        }
    }
}
int get_distance(int x, int y){
    int sisa=0,  ans=0;
    for(int i=0; i<3; i++){
        if((getA(i, y)-getA(i, x-1))!=(getB(i, y)-getB(i, x-1)))
            return -1;
        for(int j=i+1, tmp; j<3; j++){
            if(i!=j){
                tmp=min(getP(i, j, y)-getP(i, j, x-1), getP(j, i, y)-getP(j, i, x-1));
                ans+=tmp;
                sisa+=max(getP(i, j, y)-getP(i, j, x-1), getP(j, i, y)-getP(j, i, x-1))-tmp;
            }
        }
    }
    return ans+sisa*2/3;
	return 0;
}

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