제출 #735791

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
735791		NatInTheHat	DNA 돌연변이 (IOI21_dna)	C++17	35 / 100	48 ms	6356 KiB

dna

#include <bits/stdc++.h>
using namespace std;
#define rep(i, a, b) for(int i = a; i < (b); ++i)
#define all(x) begin(x), end(x)
#define sz(x) (int)(x).size()
typedef long long ll;
typedef long double ld;
typedef pair<int, int> pii;
typedef vector<int> vi;

template<class T, class U> istream& operator>>(istream &is, pair<T, U>& p) { is >> p.first >> p.second; return is; }
template<class T> istream& operator>>(istream& is, vector<T>& vec) { for(auto &x : vec) cin >> x; return is; } 
template<class T, class U> ostream& operator<<(ostream &os, pair<T, U>& p) { os << "<" << p.first << "," << p.second << ">"; return os; }
template<class T> ostream& operator<<(ostream& os, vector<T>& vec) { for(auto x : vec) os << x << " "; return os; }

int conv(char c) {
    if (c == 'A') return 0;
    else if (c == 'C') return 1;
    return 2;
}
const int TYPES = 9, MAXN = 100010;
int prefs[TYPES][MAXN];
int n;

void init(string sa, string sb) {
    n = sa.size();

    vector<int> a(n), b(n);
    
    for (int i = 0; i < n; i++) {
        a[i] = conv(sa[i]);
        b[i] = conv(sb[i]);
    }

    for (int i = 0; i < n; i++) {
        int type = a[i] * 3 + b[i];
        prefs[type][i]++;

        if (i > 0) {
            for (int t = 0; t < TYPES; t++) {
                prefs[t][i] += prefs[t][i-1];
            }
        }
    }
}
int get_sum(int type, int l, int r) {
    if (l == 0) return prefs[type][r];
    return prefs[type][r] - prefs[type][l-1];
}
int get_distance(int l, int r) {
    vector<int> type_sums(TYPES);
    for (int t = 0; t < TYPES; t++) {
        type_sums[t] = get_sum(t, l, r);
    }
    int swaps = 0;

    // cancel out on diagonal.
    
    swaps += min(type_sums[1], type_sums[3]);
    swaps += min(type_sums[2], type_sums[6]);
    swaps += min(type_sums[5], type_sums[7]);

    vector<int> rems = {
        type_sums[1] - type_sums[3],
        type_sums[2] - type_sums[6],
        type_sums[5] - type_sums[7]
    };

    if (abs(rems[0]) == abs(rems[1]) && abs(rems[1]) == abs(rems[2])) {
        if (rems[0] == 0) return swaps;

        // if all the same sign, that's not good

        int ct = 0;
        for (int x = 0; x <= 2; x++) ct += rems[x] / abs(rems[x]);
        if (abs(ct) == 3) return -1;

        swaps += abs(rems[0]) * 2;
        return swaps;
    }
    else return -1;
}

// int main() {
//     int n, q; cin >> n >> q;
//     string sa, sb; cin >> sa >> sb;
//     init(sa, sb);

//     for (int qq = 0; qq < q; qq++) {
//         int l, r; cin >> l >> r;
//         cout << get_distance(l, r) << '\n';
//     }
//     return 0;
// }

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