Submission #958345

#	Time	Username	Problem	Language	Result	Execution time	Memory
958345		AC2K	Mutating DNA (IOI21_dna)	C++17	56 / 100	28 ms	10788 KiB

dna

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

#include <vector>
using namespace std;

int sum[300000];
int suma[3][300000], sumb[3][300000];
const string dna = "ATC";

void init(std::string a, std::string b) {
    memset(sum, 0, sizeof(sum));
    memset(suma, 0, sizeof(suma));
    memset(suma, 0, sizeof(sumb));

    for (int i = 0; i < (int)a.size(); ++i) {
        sum[i + 1] = sum[i] + (a[i] != b[i]);
    }

    for (int j = 0; j < 3; ++j) {
        for (int i = 0; i < (int)a.size(); ++i) {
            suma[j][i + 1] = suma[j][i] + (a[i] == dna[j]);
            sumb[j][i + 1] = sumb[j][i] + (b[i] == dna[j]);
        }
    }
}

int get_distance(int x, int y) {
    ++y;
    for (int i = 0; i < 3; ++i) {
        if (suma[i][y] - suma[i][x] != sumb[i][y] - sumb[i][x]) {
            return -1;
        }
    }
    return (sum[y] - sum[x] + 1) / 2;
}

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