Submission #1042457

#	Time	Username	Problem	Language	Result	Execution time	Memory
1042457		vjudge1	Mutating DNA (IOI21_dna)	C++17	0 / 100	18 ms	6840 KiB

dna

#include <bits/stdc++.h>
#include "dna.h"

using namespace std;
 
vector<long long> at, ac, ca, ct, ta, tc;
 
void init(string a,string b)
{
    int n = a.size() + 1;
    a = '#' + a;
    b = '#' + b;
    at.resize(n + 1, 0);
    ac.resize(n + 1, 0);
    ca.resize(n + 1, 0);
    ct.resize(n + 1, 0);
    ta.resize(n + 1, 0);
    tc.resize(n + 1, 0);
    for(int i = 1; i <= n; ++i)
    {
        if(a[i] == 'A')
        {
            if(b[i] == 'C')
                ac[i] = ac[i - 1] + 1;
            if(b[i] == 'T')
                at[i] = at[i - 1] + 1;
        }
        if(a[i] == 'T')
        {
            if(b[i] == 'A')
                ta[i] = ta[i - 1] + 1;
            if(b[i] == 'C')
                tc[i] = tc[i - 1] + 1;
        }
        if(a[i] == 'C')
        {
            if(b[i] == 'A')
                ca[i] = ca[i - 1] + 1;
            if(b[i] == 'T')
                ct[i] = ct[i - 1] + 1;
        }
    }
}

int get_distance(int x, int y) 
{
    int ans = 0;
    int acc = (ac[y + 1] - ac[x]);
    int att = (at[y + 1] - at[x]);
    int ctt = (ct[y + 1] - ct[x]);
    int caa = (ca[y + 1] - ca[x]);
    int tcc = (tc[y + 1] - tc[x]);
    int taa = (ta[y + 1] - ta[x]);
    if(acc + att != taa + caa)    {return -1;}
    if(caa + ctt != acc + tcc)    {return -1;}
    if(taa + tcc != att + ctt)    {return -1;}
    int mn1 = min(acc,caa), mn2 = min(att,taa), mn3 = min(tcc,ctt);
    ans += mn1 + mn2 + mn3;
    acc -= mn1;
    caa -= mn1;
    att -= mn2;
    taa -= mn2;
    tcc -= mn3;
    ctt -= mn3;
    int sum = max({att, taa, ctt, tcc, acc, caa});
    ans += sum * 2;
    return ans;
}

• Subtask 1: 0 / 21
• Subtask 2: 0 / 22
• Subtask 3: 0 / 13
• Subtask 4: 0 / 28
• Subtask 5: 0 / 16