Submission #939868

#	Time	Username	Problem	Language	Result	Execution time	Memory
939868		vladilius	Mutating DNA (IOI21_dna)	C++17	43 / 100	1537 ms	3300 KiB

dna

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using pii = pair<char, char>;

string a, b;
vector<char> x = {'A', 'C', 'T'};

void init(string as, string bs){
    a = as; b = bs;
}

int get_distance(int l, int r){
    map<char, int> mp;
    for (int i = l; i <= r; i++){
        mp[a[i]]++;
        mp[b[i]]--;
    }
    for (auto t: mp){
        if (t.second != 0){
            return -1;
        }
    }
    map<pii, int> cnt;
    for (int i = l; i <= r; i++){
        if (a[i] == b[i]) continue;
        cnt[{a[i], b[i]}]++;
    }
    vector<pair<pii, int>> arr;
    for (auto [u, v]: cnt){
        arr.push_back({u, v});
    }
    int out = 0;
    for (auto [p1, k1]: arr){
        pii p2 = {p1.second, p1.first};
        if (cnt.find(p2) == cnt.end()){
            continue;
        }
        int k2 = cnt[p2];
        out += min(k1, k2);
        if (k1 > k2){
            cnt.erase(p2);
            cnt[p1] -= k2;
        }
        else {
            cnt.erase(p1);
            cnt[p2] -= k1;
            if (!cnt[p2]){
                cnt.erase(p2);
            }
        }
    }
    vector<pair<int, pii>> f;
    for (auto [u, v]: cnt) f.push_back({v, u});
    sort(f.begin(), f.end());
    // f.back() -= f[0]
    while (f.size() > 1){
        out += f[0].first;
        f.back().first -= f[0].first;
        f.erase(f.begin());
        sort(f.begin(), f.end());
    }
    if (!f.empty()) out += f[0].first;
    return out;
}

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