Submission #521574

#	Time	Username	Problem	Language	Result	Execution time	Memory
521574		tengiz05	Selling RNA Strands (JOI16_selling_rna)	C++17	100 / 100	900 ms	102144 KiB

selling_rna

#include <bits/stdc++.h>

using i64 = long long;
constexpr i64 P = 1E9 + 7, M = 31;

struct Node {
    Node *to[4];
    int mn, mx;
    Node() {
        mn = 1E9, mx = 0;
        to[0] = to[1] = to[2] = to[3] = nullptr;
    }
};
void add(Node *u, std::string &s, int i, int p) {
    if (i == int(s.size())) {
        u->mn = std::min(u->mn, p);
        u->mx = std::max(u->mx, p);
        return;
    }
    int x = std::string("AGCU").find(s[i]);
    if (u->to[x] == nullptr) {
        u->to[x] = new Node();
    }
    add(u->to[x], s, i + 1, p);
    u->mn = std::min(u->mn, p);
    u->mx = std::max(u->mx, p);
}
std::pair<int, int> find(Node *u, std::string &s, int i) {
    if (i == int(s.size())) {
        return {u->mn, u->mx};
    }
    int x = std::string("AGCU").find(s[i]);
    if (u->to[x] == nullptr) {
        return {-1, -1};
    }
    return find(u->to[x], s, i + 1);
}

int main() {
    std::ios::sync_with_stdio(false);
    std::cin.tie(nullptr);
    
    int n, m;
    std::cin >> n >> m;
    
    std::vector<std::string> s(n);
    Node *root = new Node();
    for (int i = 0; i < n; i++) {
        std::cin >> s[i];
    }
    
    std::sort(s.begin(), s.end());
    for (int i = 0; i < n; i++) {
        add(root, s[i], 0, i);
    }
    
    std::vector<std::tuple<int, int, int, int>> Q;
    std::vector<int> f;
    
    for (int i = 0; i < m; i++) {
        std::string p, q;
        std::cin >> p >> q;
        auto [l, r] = find(root, p, 0);
        if (l == -1) {
            continue;
        }
        r++;
        i64 H = 0;
        for (char c : q) {
            H *= M;
            H += std::string("AGCU").find(c) + 1;
            H %= P;
        }
        Q.emplace_back(l, H, i, -1);
        Q.emplace_back(r, H, i, 1);
        f.push_back(H);
    }
    for (int i = 0; i < n; i++) {
        i64 h = 0, pw = 1;
        for (int j = int(s[i].size()) - 1; j >= 0; j--) {
            h = (h + pw * (std::string("AGCU").find(s[i][j]) + 1)) % P;
            pw *= M;
            pw %= P;
            f.push_back(h);
        }
    }
    
    std::sort(f.begin(), f.end());
    f.erase(std::unique(f.begin(), f.end()), f.end());
    
    std::sort(Q.begin(), Q.end());
    
    std::vector<int> ans(m);
    
    std::vector<int> cnt(f.size());
    int j = 0;
    for (int i = 0; i < n; i++) {
        int p, H, id, t;
        while (j < int(Q.size())) {
            std::tie(p, H, id, t) = Q[j];
            if (p != i) {
                break;
            }
            H = std::lower_bound(f.begin(), f.end(), H) - f.begin();
            ans[id] += t * cnt[H];
            j++;
        }
        i64 h = 0, pw = 1;
        for (int j = int(s[i].size()) - 1; j >= 0; j--) {
            h = (h + pw * (std::string("AGCU").find(s[i][j]) + 1)) % P;
            pw *= M;
            pw %= P;
            int H = std::lower_bound(f.begin(), f.end(), h) - f.begin();
            cnt[H]++;
        }
    }
    while (j < int(Q.size())) {
        int p, H, id, t;
        std::tie(p, H, id, t) = Q[j];
        H = std::lower_bound(f.begin(), f.end(), H) - f.begin();
        ans[id] += t * cnt[H];
        j++;
    }
    
    for (int i = 0; i < m; i++) {
        std::cout << ans[i] << "\n";
    }
    
    return 0;
}

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