Submission #1256406

#	Time	Username	Problem	Language	Result	Execution time	Memory
1256406		wedonttalkanymore	Selling RNA Strands (JOI16_selling_rna)	C++20	35 / 100	310 ms	349704 KiB

selling_rna

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

#define pii pair<ll, ll>
#define fi first
#define se second

const ll N = 2e5 + 5, inf = 1e18;
const int MAXT = 2000005;

int n, m;
string a[N], b[N], c[N];
int L[MAXT], R[MAXT];
int child[2][MAXT][26], cnt;
vector<int> pre[MAXT];

void add(int type, string s, int pos) {
    int u = 0;
    if (type) reverse(s.begin(), s.end());
    for (char ch : s) {
        int k = ch - '0';
        if (!child[type][u][k]) child[type][u][k] = ++cnt;
        u = child[type][u][k];
        if (!type) {
            if (!L[u]) L[u] = pos;
            R[u] = pos;
        } else {
            pre[u].push_back(pos);
        }
    }
}

int get0(string s) {
    int u = 0;
    for (char ch : s) {
        int k = ch - '0';
        if (!child[0][u][k]) return 0;
        u = child[0][u][k];
    }
    return u;
}

vector<int> get1(string s) {
    int u = 0;
    reverse(s.begin(), s.end());
    for (char ch : s) {
        int k = ch - '0';
        if (!child[1][u][k]) return {};
        u = child[1][u][k];
    }
    return pre[u];
}

signed main() {
    ios::sync_with_stdio(false);
    cin.tie(0);

    cin >> n >> m;
    for (int i = 1; i <= n; i++) cin >> a[i];
    for (int i = 1; i <= m; i++) cin >> b[i] >> c[i];

    sort(a + 1, a + n + 1);
    for (int i = 1; i <= n; i++) {
        add(0, a[i], i);
        add(1, a[i], i);
    }

    for (int i = 1; i <= m; i++) {
        int val1 = get0(b[i]);
        vector<int> val2 = get1(c[i]);

        if (!val1 || L[val1] == 0 || R[val1] == 0 || val2.empty()) {
            cout << 0 << '\n';
            continue;
        }

        int it1 = lower_bound(val2.begin(), val2.end(), L[val1]) - val2.begin();
        int it2 = upper_bound(val2.begin(), val2.end(), R[val1]) - val2.begin() - 1;

        if (it1 > it2) {
            cout << 0 << '\n';
        } else {
            cout << it2 - it1 + 1 << '\n';
        }
    }
    return 0;
}

• Subtask 1: 10 / 10
• Subtask 2: 0 / 25
• Subtask 3: 25 / 25
• Subtask 4: 0 / 40