Submission #506502

#	Time	Username	Problem	Language	Result	Execution time	Memory
506502		CasperWong	Mutating DNA (IOI21_dna)	C++17	100 / 100	55 ms	28140 KiB

dna

#include<bits/stdc++.h>
using namespace std;
long long n,q,x,y,ans,len,temp1,temp2,cnt[100100][5][5],freqa[5][100100],freqb[5][100100];
void init(std::string a, std::string b) {
  n=a.length();  
  for(int i=0;i<n;i++){
		if(i>0){
			freqa[1][i]=freqa[1][i-1];
			freqb[1][i]=freqb[1][i-1];
			freqa[2][i]=freqa[2][i-1];
			freqb[2][i]=freqb[2][i-1];
			freqa[3][i]=freqa[3][i-1];
			freqb[3][i]=freqb[3][i-1];
		}
		if(a[i]=='A'){
			freqa[1][i]++;
		}else if(a[i]=='T'){
			freqa[2][i]++;
		}else{
			freqa[3][i]++;
		}
		if(b[i]=='A'){
			freqb[1][i]++;
		}else if(b[i]=='T'){
			freqb[2][i]++;
		}else{
			freqb[3][i]++;
		}
		for(int j=1;j<=3;j++){
			for(int k=1;k<=3;k++){
				if(i>0){
					cnt[i][j][k]=cnt[i-1][j][k];
				}
			}
		}
		if(a[i]=='A'){
			if(b[i]=='A'){
				cnt[i][1][1]++;
			}else if(b[i]=='T'){
				cnt[i][1][2]++;
			}else{
				cnt[i][1][3]++;
			}
		}else if(a[i]=='T'){
			if(b[i]=='A'){
				cnt[i][2][1]++;
			}else if(b[i]=='T'){
				cnt[i][2][2]++;
			}else{
				cnt[i][2][3]++;
			}
		}else{
			if(b[i]=='A'){
				cnt[i][3][1]++;
			}else if(b[i]=='T'){
				cnt[i][3][2]++;
			}else{
				cnt[i][3][3]++;
			}
		}
	}
}
 
int get_distance(int x, int y) {
    ans=0;
	temp1=0;
	temp2=0;
	if((freqa[1][y]-freqa[1][x-1]!=freqb[1][y]-freqb[1][x-1])||(freqa[2][y]-freqa[2][x-1]!=freqb[2][y]-freqb[2][x-1])||(freqa[3][y]-freqa[3][x-1]!=freqb[3][y]-freqb[3][x-1])){
		return -1;
	}
	temp1=(cnt[y][1][2]-cnt[x-1][1][2])+(cnt[y][2][3]-cnt[x-1][2][3])+(cnt[y][3][1]-cnt[x-1][3][1]);
	temp2=(cnt[y][1][3]-cnt[x-1][1][3])+(cnt[y][3][2]-cnt[x-1][3][2])+(cnt[y][2][1]-cnt[x-1][2][1]);
	ans=abs(temp1-temp2)*2/3+min(temp1,temp2);
	return ans;
}

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