Submission #964671

#	Time	Username	Problem	Language	Result	Execution time	Memory
964671		KasymK	Mutating DNA (IOI21_dna)	C++17	56 / 100	31 ms	5204 KiB

dna

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

using namespace std;

string s, s2;
int n;

const int N = 1e5 + 5;
 
int p_a[N] = {0}, p_b[N] = {0}, p_bile[N] = {0};

void init(string a, string b){
    s = a;
    s2 = b;
    n = (int)s.size();
    for(int i = 0; i < n; ++i){
		p_a[i + 1] = p_a[i];
		p_b[i + 1] = p_b[i];
		p_bile[i + 1] = p_bile[i];
		if(a[i] == 'A')
			p_a[i + 1]++;
		if(b[i] == 'A')
			p_b[i + 1]++;
		if(a[i] == b[i])
			p_bile[i + 1]++;
	}
}

int get_distance(int x, int y){
    if(y - x > 2){
        int uz_a = p_a[y + 1] - p_a[x], uz_b = p_b[y + 1] - p_b[x];
        int uz_bile = p_bile[y + 1] - p_bile[x];
        if(uz_a != uz_b)
            return -1;
        else{
            int ret = (y - x + 1 - uz_bile) >> 1;
            return ret;
        }
    }
    int s_a = 0, s_c = 0, s_t = 0;
    int s2_a = 0, s2_c = 0, s2_t = 0;
    for(int i = x; i <= y; ++i){
        s_a += (s[i] == 'A');
        s_c += (s[i] == 'C');
        s_t += (s[i] == 'T');
        s2_a += (s2[i] == 'A');
        s2_c += (s2[i] == 'C');
        s2_t += (s2[i] == 'T');
    }
    if(s_a != s2_a or s_c != s2_c or s_t != s2_t)
        return -1;
    int ok = 1;
    for(int i = x; i <= y; ++i)
        ok &= (s[i] == s2[i]);
    if(ok)
        return 0;
    int ans = 0;
    for(int i = x; i <= y; ++i)
        ans += (s[i] != s2[i]);
    ans--;
    return ans;
}

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