제출 #1279943

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1279943		mntt	Selling RNA Strands (JOI16_selling_rna)	C++20	100 / 100	181 ms	218600 KiB

selling_rna

///Author: MNTT - Tien Giang High School for the Gifted
#include <bits/stdc++.h>
using namespace std;

#define fi first
#define sc second
#define ll long long
#define pb push_back
#define pii pair<int, int>
#define ALL(a) a.begin(), a.end()
#define REP(i, n) for(auto i = 0; i < (n); ++i)
#define FOR(i, a, b) for(auto i = (a); i <= (b); ++i)
#define FORD(i, a, b) for(auto i = (a); i >= (b); --i)

const int N = 1e6 + 5;
const int MOD = 998244353;
const int INF = 2e9;

int n, q;
string a[N];

int encode(char c) {
    if (c == 'A') return 0;
    if (c == 'C') return 1;
    if (c == 'G') return 2;
    return 3;
}

struct Trie {
    struct Node {
        Node* child[4];
        int l, r;

        Node() {
            FOR(i, 0, 3) child[i] = 0;
            l = INF;
            r = 0;
        }
    };

    Node* root;

    Trie() {
        root = new Node();
    }

    void add(const string &s, int idx) {
        Node* p = root;
        for (char c : s) {
            int x = encode(c);
            if (!p->child[x]) p->child[x] = new Node();
            p = p->child[x];
            p->l = min(p->l, idx);
            p->r = max(p->r, idx);
        }
    }

    pii get(const string &s) {
        Node* p = root;
        for (char c : s) {
            int x = encode(c);
            if (!p->child[x]) return {INF, INF};
            p = p->child[x];
        }
        return {p->l, p->r};
    }
};

struct RevTrie {
    struct Node {
        Node* child[4];
        vector<int> id;

        Node() {
            FOR(i, 0, 3) child[i] = 0;
        }
    };

    Node* root;

    RevTrie() {
        root = new Node();
    }

    void add(string s, int idx) {
        reverse(ALL(s));
        Node* p = root;
        for (char c : s) {
            int x = encode(c);
            if (!p->child[x]) p->child[x] = new Node();
            p = p->child[x];
            p->id.pb(idx);
        }
    }

    int get(const string &s, pii range) {
        int l = range.fi, r = range.sc;
        if (l == r && l == INF) return 0;

        Node* p = root;
        for (char c : s) {
            int x = encode(c);
            if (!p->child[x]) return 0;
            p = p->child[x];
        }

        return upper_bound(ALL(p->id), r) - lower_bound(ALL(p->id), l);
    }
};

void solve()
{
    cin >> n >> q;
    FOR(i, 1, n) cin >> a[i];
    sort(a + 1, a + 1 + n);

    Trie prefix;
    RevTrie suffix;

    FOR(i, 1, n) {
        prefix.add(a[i], i);
        suffix.add(a[i], i);
    }

    while (q--) {
        string pre, suf;
        cin >> pre >> suf;
        reverse(ALL(suf));
        cout << suffix.get(suf, prefix.get(pre)) << "\n";
    }
}

signed main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    #define NAME "main"
    if (fopen(NAME".inp", "r")) {
        freopen(NAME".inp", "r", stdin);
        freopen(NAME".out", "w", stdout);
    }

    solve();

    ///cerr << "Time elapsed: " << (1.0 * clock() / CLOCKS_PER_SEC) << "s";
    return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

selling_rna.cpp: In function 'int main()':
selling_rna.cpp:141:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  141 |         freopen(NAME".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
selling_rna.cpp:142:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  142 |         freopen(NAME".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 25 / 25
• Subtask 3: 25 / 25
• Subtask 4: 40 / 40