Submission #954821

#	Time	Username	Problem	Language	Result	Execution time	Memory
954821		4QT0R	Mutating DNA (IOI21_dna)	C++17	100 / 100	31 ms	6156 KiB

dna

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

int ac[100002];
int ca[100002];
int at[100002];
int ta[100002];
int ct[100002];
int tc[100002];
int n;

void init(string a, string b){
	n=a.size();
	for (int i = 1; i<=n; i++){
		ac[i]=ac[i-1];
		ca[i]=ca[i-1];
		at[i]=at[i-1];
		ta[i]=ta[i-1];
		ct[i]=ct[i-1];
		tc[i]=tc[i-1];
		if (a[i-1]=='A'){
			if (b[i-1]=='C')ac[i]++;
			if (b[i-1]=='T')at[i]++;
		}
		else if (a[i-1]=='C'){
			if (b[i-1]=='A')ca[i]++;
			if (b[i-1]=='T')ct[i]++;
		}
		else{
			if (b[i-1]=='A')ta[i]++;
			if (b[i-1]=='C')tc[i]++;
		}
	}
}

int get_distance(int x, int y){
	y++;
	int pac=ac[y]-ac[x];
	int pca=ca[y]-ca[x];
	int pat=at[y]-at[x];
	int pta=ta[y]-ta[x];
	int pct=ct[y]-ct[x];
	int ptc=tc[y]-tc[x];
	int ans=0;
	int a1=pac+pat,a2=pca+pta,t1=pta+ptc,t2=pat+pct,c1=pca+pct,c2=pac+ptc;
	if (a1!=a2 || t1!=t2 || c1!=c2)return -1;
	if (pca<pac){
		ans+=pca;
		pac-=pca;
		ans+=2*pac;
	}
	else{
		ans+=pac;
		pca-=pac;
		ans+=2*pca;
	}
	if (pat<pta){
		ans+=pat;
		pta-=pat;
	}
	else{
		ans+=pta;
		pat-=pta;
	}
	if (pct<ptc){
		ans+=pct;
		ptc-=pct;
	}
	else{
		ans+=ptc;
		pct-=ptc;
	}
	return ans;
}

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