Submission #866798

#	Time	Username	Problem	Language	Result	Execution time	Memory
866798		harao	Selling RNA Strands (JOI16_selling_rna)	C++17	35 / 100	630 ms	252484 KiB

selling_rna

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

const int N = 5e3+7;
const int M = 2e5+7;
const int base = 33;
const int mod = 1e9+7;
using ll = long long;

string s[N];
ll ha1[N][N],ha2[N][N],h[N];
int n,m;

ll get1(int i, int l, int r)
{
    return (ha1[i][r] - ha1[i][l-1]*h[r-l+1] + 1ll*mod*mod)%mod;
}

ll get2(int i, int l, int r)
{
    return (ha2[i][r] - ha2[i][l-1]*h[r-l+1] + 1ll*mod*mod)%mod;
}

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


    cin>>n>>m;
    int max_len = 0;
    for(int i = 1; i <= n; i++)
    {
        cin>>s[i];
        max_len = max(max_len,(int)s[i].size());
    }

    for(int i = 1; i <= n; i++)
    {
        ha1[i][0] = 0;
        string st = s[i];
        int sz = s[i].size();
        s[i] = " " + s[i];
        reverse(st.begin(),st.end());
        st = " " + st;
        for(int j = 1; j <= sz; j++)
        {
            ha1[i][j] = (ha1[i][j-1]*base + s[i][j])%mod;
            ha2[i][j] = (ha2[i][j-1]*base + st[j])%mod;
        }
    }

    h[0] = 1;
    for(int i = 1; i <= max_len; i++)
    {
        h[i] = (h[i-1]*base)%mod;
    }

    for(int i = 1; i <= m; i++)
    {
        string s1,s2;
        cin>>s1>>s2;
        int sz1 = s1.size(), sz2 = s2.size();
        reverse(s2.begin(),s2.end());
        s1 = " " + s1, s2 = " " + s2;
        ll ha1 = 0, ha2 = 0;
        for(int j = 1; j <= sz1; j++)
        {
            ha1 = (ha1*1ll*base + s1[j])%mod;
        }
        for(int j = 1; j <= sz2; j++)
        {
            ha2 = (ha2*1ll*base + s2[j])%mod;
        }

        int cnt = 0;
        for(int i1 = 1; i1 <= n; i1++)
        {
            int sz = s[i1].size() - 1;
            if(get1(i1,1,sz1) == ha1 && get2(i1,1,sz2) == ha2) cnt++;
        }
        cout<<cnt<<"\n";
    }
    return 0;
}

Compilation message (stderr)

selling_rna.cpp: In function 'int main()':
selling_rna.cpp:79:17: warning: unused variable 'sz' [-Wunused-variable]
   79 |             int sz = s[i1].size() - 1;
      |                 ^~

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