Submission #1097370

#	Time	Username	Problem	Language	Result	Execution time	Memory
1097370		vjudge1	Genetics (BOI18_genetics)	C++14	100 / 100	235 ms	33636 KiB

genetics

#include<bits/stdc++.h>
#define ll long long
using namespace std;
int n,m,k;
const int mod=1e9+7,base=331;
ll const_string[5000],Sum,pos[70][5000],Hash[5000];
string xau[5000];
void Solve()
{
    for(int i=1;i<=n;i++)
    {
     ll tong=0;
     for(int j=1;j<=m;j++)
     {
        tong+=pos[xau[i][j]-'A'][j]-const_string[i];
     }
     if(tong==(Sum-const_string[i])*(m-k))
      {
        cout<<i;
        return;
      }
    }
}
void Input()
{
    cin>>n>>m>>k;
    Sum=0;
    for(int i=1;i<=n;i++)
    {
     cin>>xau[i];
     xau[i]=" "+xau[i];
     Hash[0]=0;
     for(int j=1;j<=m;j++)
     {
       Hash[j]=(Hash[j-1]*base%mod+xau[i][j]-'A')%mod;
     }
     const_string[i]=Hash[m];
     Sum+=const_string[i];
     for(int j=1;j<=m;j++)
    {
     pos[xau[i][j]-'A'][j]+=const_string[i];
    }
    }
}
int main()
{
 ios_base::sync_with_stdio(false);
 cin.tie(NULL);
 cout.tie(NULL);
 if(fopen("a.inp","r"))
 {
 freopen("a.inp","r",stdin);
 freopen("a.out","w",stdout);
 }
 Input();
 Solve();
}

Compilation message (stderr)

genetics.cpp: In function 'int main()':
genetics.cpp:52:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   52 |  freopen("a.inp","r",stdin);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~
genetics.cpp:53:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   53 |  freopen("a.out","w",stdout);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~

• Subtask 1: 27 / 27
• Subtask 2: 19 / 19
• Subtask 3: 28 / 28
• Subtask 4: 26 / 26