Submission #1024004

#	Time	Username	Problem	Language	Result	Execution time	Memory
1024004		mdn2002	Mutating DNA (IOI21_dna)	C++17	100 / 100	32 ms	7508 KiB

dna

/*
Mayoeba Yabureru
*/
#include<bits/stdc++.h>
using namespace std;
int sum[100005][3][3];
map<char, int> mp;
void init(string a, string b) {
    mp['A'] = 0, mp['T'] = 1, mp['C'] = 2;
    int n = a.size();
    for (int i = 0; i < n; i ++) {
        sum[i][mp[a[i]]][mp[b[i]]] ++;
        if (i) {
            for (int j = 0; j < 3; j ++) {
                for (int z = 0; z < 3; z ++) sum[i][j][z] += sum[i - 1][j][z];
            }
        }
    }
}

int get_distance(int x, int y) {
    int dsum[3][3], ans = 0;
    for (int i = 0; i < 3; i ++) {
        for (int j = 0; j < 3; j ++) {
            dsum[i][j] = sum[y][i][j];
            if (x != 0) dsum[i][j] -= sum[x - 1][i][j];
        }
    }
    dsum[0][0] = dsum[1][1] = dsum[2][2] = 0;
    for (int i = 0; i < 3; i ++) {
        for (int j = 0; j < 3; j ++) {
            if (i == j) continue;
            int ad = min(dsum[i][j], dsum[j][i]);
            dsum[i][j] -= ad, dsum[j][i] -= ad;
            ans += ad;
        }
    }
    int ad = min({dsum[0][1], dsum[1][2], dsum[2][0]});
    dsum[0][1] -= ad, dsum[1][2] -= ad, dsum[2][0] -= ad;
    ans += ad * 2;

    ad = min({dsum[0][2], dsum[2][1], dsum[1][0]});
    dsum[0][2] -= ad, dsum[2][1] -= ad, dsum[1][0] -= ad;
    ans += ad * 2;

    for (int i = 0; i < 3; i ++) {
        for (int j = 0; j < 3; j ++) {
            if (dsum[i][j]) return -1;
        }
    }
    return ans;
}

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