Submission #528782

#	Time	Username	Problem	Language	Result	Execution time	Memory
528782		happypotato	Mutating DNA (IOI21_dna)	C++17	56 / 100	34 ms	6248 KiB

dna

#include "dna.h"
#include <bits/stdc++.h>
using namespace std;
const int mxN = 1e5 + 1;
int ps[2][mxN][3];
map<char, int> conv = {{'A', 0}, {'C', 1}, {'T', 2}};
void init(string a, string b) {
    int n = a.length();
    for (int i = 1; i <= n; i++) {
        for (int j = 0; j < 3; j++) {
            ps[0][i][j] = ps[0][i - 1][j];
            ps[1][i][j] = ps[1][i - 1][j];
        }
        if (a[i - 1] == b[i - 1]) continue;
        ps[0][i][conv[a[i - 1]]]++;
        ps[1][i][conv[b[i - 1]]]++;
    }
}
int get_distance(int x, int y) {
    x++; y++;
    int ans = 0;
    for (int i = 0; i < 3; i++) {
        if (ps[0][y][i] - ps[0][x - 1][i] != ps[1][y][i] - ps[1][x - 1][i]) return -1;
        ans += ps[0][y][i] - ps[0][x - 1][i];
    }
    return ans / 2 + ans % 2;
}

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