Submission #707805

#	Time	Username	Problem	Language	Result	Execution time	Memory
707805		josanneo22	Mutating DNA (IOI21_dna)	C++17	100 / 100	36 ms	7316 KiB

dna

#include "dna.h"
#include<bits/stdc++.h>
 
using namespace std;
typedef long long int lld;
#define rep(i,a,b) for(int i=a;i<b;i++)
#define trav(a,v) for(auto a:v)
 
int pref[1000000][3][3];
map<char,int> m;
void init(std::string a, std::string b) {
	m['A']=0;
	m['C']=1;
	m['T']=2;
	rep(j,0,3){
		rep(k,0,3){
			pref[0][j][k]=0;
		}
	}
	rep(i,0,(int)a.size()){
		rep(j,0,3){
			rep(k,0,3){
				pref[i+1][j][k]=pref[i][j][k];
			}
		}
		pref[i+1][m[a[i]]][m[b[i]]]++;
	}
}
int arr[3][3];
int get_distance(int x, int y) {
	y++;
	rep(i,0,3){
		rep(j,0,3){
			arr[i][j]=pref[y][i][j]-pref[x][i][j];
		}
	}
	int bal[3];
	rep(i,0,3)bal[i]=0;
	rep(i,0,3){
		rep(j,0,3){
			bal[i]+=arr[i][j];
			bal[j]-=arr[i][j];
		}
	}
	rep(i,0,3){
		if(bal[i]!=0)return -1;
	}
	int ans=0;
	rep(i,0,3){
		rep(j,0,3){
			if(i==j)arr[i][j]=0;
			int k=min(arr[i][j],arr[j][i]);
			ans+=k;
			arr[i][j]-=k;
			arr[j][i]-=k;
			//cerr<<arr[i][j]<<" ";
		}//cerr<<endl;
	}
	int tot=0;
	rep(i,0,3){
		rep(j,0,3){
			tot+=arr[i][j];
		}
	}
	tot/=3;
	tot*=2;
	ans+=tot;
	return ans;
}

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