Submission #633180

#	Time	Username	Problem	Language	Result	Execution time	Memory
633180		Iwanttobreakfree	Selling RNA Strands (JOI16_selling_rna)	C++17	10 / 100	1587 ms	42168 KiB

selling_rna

#include <iostream>
#include <vector>
using namespace std;
#define int long long
#define pii pair<int,int>
const int mod=1e9+7,t=70,mod2=1e9+9,sz=101;
vector<vector<int>> pre_hash;
vector<int> pre;
int get_hash(int a,int sz,int i){
    int ans=(pre_hash[i][a+sz]-1ll*pre_hash[i][a]*pre[sz])%mod;
    if(ans<0)ans+=mod;
    return ans;
}
signed main(){
    int n,m;
    cin>>n>>m;
    string s,st;
    pre_hash=vector<vector<int>> (n,vector<int>(sz));
    pre=vector<int> (sz);
    pre[0]=1;
    vector<int> siz(n);
    for(int i=1;i<sz;i++)pre[i]=(pre[i-1]*t)%mod;
    for(int i=0;i<n;i++){
        cin>>s;
        siz[i]=s.size();
        for(int j=0;j<s.size();j++){
            pre_hash[i][j+1]=(pre_hash[i][j]*t+s[j]-'A'+1)%mod;
        }
    }
    /*for(int i=0;i<n;i++){
        for(int j=0;j<=siz[i];j++)cout<<pre_hash[i][j]<<' ';
        cout<<'\n';
    }*/
    while(m--){
        cin>>s>>st;
        int hash1=0,hash2=0;
        for(int i=0;i<s.size();i++){
            hash1=(hash1*t+s[i]-'A'+1)%mod;
        }
        for(int i=0;i<st.size();i++){
            hash2=(hash2*t+st[i]-'A'+1)%mod;
        }
        //cout<<hash1<<' '<<hash2<<'\n';
        int ans=0;
        for(int i=0;i<n;i++){
            if(siz[i]>=max(s.size(),st.size())&&hash1==get_hash(0,s.size(),i)&&hash2==get_hash(siz[i]-st.size(),st.size(),i))ans++;
        }
        cout<<ans<<'\n';
    }
}

Compilation message (stderr)

selling_rna.cpp: In function 'int main()':
selling_rna.cpp:26:22: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   26 |         for(int j=0;j<s.size();j++){
      |                     ~^~~~~~~~~
selling_rna.cpp:37:22: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   37 |         for(int i=0;i<s.size();i++){
      |                     ~^~~~~~~~~
selling_rna.cpp:40:22: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   40 |         for(int i=0;i<st.size();i++){
      |                     ~^~~~~~~~~~
selling_rna.cpp:46:22: warning: comparison of integer expressions of different signedness: '__gnu_cxx::__alloc_traits<std::allocator<long long int>, long long int>::value_type' {aka 'long long int'} and 'const long unsigned int' [-Wsign-compare]
   46 |             if(siz[i]>=max(s.size(),st.size())&&hash1==get_hash(0,s.size(),i)&&hash2==get_hash(siz[i]-st.size(),st.size(),i))ans++;

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