Submission #938091

#	Time	Username	Problem	Language	Result	Execution time	Memory
938091		codefox	Selling RNA Strands (JOI16_selling_rna)	C++14	60 / 100	1550 ms	189992 KiB

selling_rna

#include <bits/stdc++.h>

using namespace std;

#pragma GCC optimize("O2")

int N = 2*1e6+1;

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

    //freopen("input.txt", "r", stdin);
    //freopen("output.txt", "w", stdout);

    int n, m;
    cin >> n >> m;

    vector<array<int, 4>> prefix(N, {-1, -1, -1, -1});
    vector<array<int, 4>> suffix(N, {-1, -1, -1, -1});
    vector<int> preind(N, -1);
    vector<int> sufind(N, -1);

    vector<vector<int>> pnodes(N);
    vector<vector<int>> snodes(N);

    vector<int> alph(100);
    alph['A'] = 0;
    alph['C'] = 1;
    alph['G'] = 2;
    alph['U'] = 3; 

    vector<string> ns(n);
    vector<int> pind(m);
    vector<int> sind(m);
    int cp = 0;
    int cs = 0;
    int dp = 0;
    int ds = 0;

    for (int i = 0; i < n; i++) cin >> ns[i];

    for (int i = 0; i < m; i++)
    {
        string a, b;
        cin >> a >> b;
        reverse(b.begin(), b.end());

        int curr = 0;
        for (char c:a)
        {
            int next = alph[c];
            if (prefix[curr][next]==-1)
            {
                prefix[curr][next] = ++cp;
            }   
            curr = prefix[curr][next];
        }
        if (preind[curr]==-1) 
        {
            preind[curr] = ++dp;
            pind[i] = dp;
        }
        else pind[i] = preind[curr];
        

        curr = 0;
        for (char c:b)
        {
            int next = alph[c];
            if (suffix[curr][next]==-1)
            {
                suffix[curr][next] = ++cs;
            }   
            curr = suffix[curr][next];
        }
        if (sufind[curr] ==-1) 
        {
            sufind[curr] = ++ds;
            sind[i] = ds;
        }
        else sind[i] =sufind[curr];
    }


    for (int i = 0; i < n; i++)
    {
        int curr = 0;
        for (char c:ns[i])
        {
            int next = alph[c];
            curr = prefix[curr][next];
            if (curr == -1) break;
            if (preind[curr]!=-1) pnodes[preind[curr]].push_back(i);
        }
        reverse(ns[i].begin(), ns[i].end());
        curr = 0;
        for (char c:ns[i])
        {
            int next = alph[c];
            curr = suffix[curr][next];
            if (curr == -1) break;
            if (sufind[curr]!=-1)  snodes[sufind[curr]].push_back(i);
        }
    }

    for (int i = 0; i < m; i++)
    {
        int p1 = 0;
        int p2 = 0;
        int sol = 0;
        int pi = pind[i];
        int si = sind[i];
        while (p1 < pnodes[pi].size() && p2 < snodes[si].size())
        {
            if (pnodes[pi][p1] == snodes[si][p2]) 
            {
                p1++;
                p2++;
                sol++;
            }
            else if (pnodes[pi][p1] > snodes[si][p2]) p2++;
            else p1++;
        }
        cout << sol << "\n";
    }

    return 0;
}

Compilation message (stderr)

selling_rna.cpp: In function 'int main()':
selling_rna.cpp:116:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  116 |         while (p1 < pnodes[pi].size() && p2 < snodes[si].size())
      |                ~~~^~~~~~~~~~~~~~~~~~~
selling_rna.cpp:116:45: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  116 |         while (p1 < pnodes[pi].size() && p2 < snodes[si].size())
      |                                          ~~~^~~~~~~~~~~~~~~~~~~

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