Submission #1256403

#	Time	Username	Problem	Language	Result	Execution time	Memory
1256403		wedonttalkanymore	Selling RNA Strands (JOI16_selling_rna)	C++20	35 / 100	287 ms	349612 KiB

selling_rna

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

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

const ll N = 2e5 + 5, inf = 1e18, mod = 1e9 + 7, block = 320, lim = 1 << 16;

int n, m;
string a[N], b[N], c[N];
int L[2000005], R[2000005];
int child[2][2000005][26], cnt;
vector <int> pre[2000005];

void add(int type, string s, int pos) {
    int u = 0;
    if (type) reverse(s.begin(), s.end());
    for (int i = 0; i < s.size(); i++) {
        int k = s[i] - '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 (int i = 0; i < s.size(); i++) {
        int k = s[i] - '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 (int i = 0; i < s.size(); i++) {
        int k = s[i] - '0';
        if (!child[1][u][k]) return vector <int> (1, -1);
        u = child[1][u][k];
    }
    return pre[u];
}

signed main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    if (fopen(".inp", "r")) {
        freopen(".inp", "r", stdin);
        freopen(".out", "w", stdout);
    }
    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++) {
        auto val1 = get0(b[i]); // doan [L, R] tien to
        auto val2 = get1(c[i]); // vector chua cac con thoa man hau to
        if (L[val1] == 0 || val2.empty()) {
            cout << 0 << '\n';
            continue;
        }
        auto it1 = lower_bound(val2.begin(), val2.end(), L[val1]) - val2.begin();
        auto it2 = upper_bound(val2.begin(), val2.end(), R[val1]) - val2.begin() - 1;
        cout << it2 - it1 + 1 << '\n';
    }
    return 0;
}

Compilation message (stderr)

selling_rna.cpp: In function 'int main()':
selling_rna.cpp:60:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   60 |         freopen(".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~
selling_rna.cpp:61:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   61 |         freopen(".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~

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