Submission #751637

#	Time	Username	Problem	Language	Result	Execution time	Memory
751637		bgnbvnbv	Genetics (BOI18_genetics)	C++14	100 / 100	483 ms	39800 KiB

genetics

#include<bits/stdc++.h>
#define TASKNAME "codeforce"
#define pb push_back
#define pli pair<int,int>
#define fi first
#define se second
#define fastio ios_base::sync_with_stdio(false); cin.tie(NULL);
using namespace std;
using ll=long long;
const ll maxN=2e5;
const ll inf=1e18;
const ll mod=1e9+7;
ll n,m;
string s[maxN];
ll pw[maxN];
ll val[maxN][4];
char c[]={'A','C','G','T'};
ll k;
ll base=311;

void solve()
{
    cin >> n >> m >> k;
    for(int i=1;i<=n;i++) cin >> s[i],s[i]=' '+s[i];
    pw[0]=1;
    for(int i=1;i<=n;i++) pw[i]=pw[i-1]*base%mod;;
    for(int i=1;i<=n;i++)
    {
        for(int j=1;j<=m;j++)
        {
            for(int d=0;d<4;d++)
            {
                if(s[i][j]!=c[d])
                {
                    val[j][d]+=pw[i];
                    val[j][d]%=mod;
                }
            }
        }
    }
    for(int i=1;i<=n;i++)
    {
        ll sum=0,check=0;
        for(int j=1;j<=n;j++)
        {
            if(j!=i)
            {
                sum+=pw[j]*k%mod;
                sum%=mod;
            }
        }
        for(int j=1;j<=m;j++)
        {
            for(int d=0;d<4;d++)
            {
                if(s[i][j]==c[d]) check+=val[j][d],check%=mod;
            }
        }
        if(check==sum)
        {
            cout << i;
        }
    }
}
int main()
{
    fastio
    //freopen(TASKNAME".INP","r",stdin);
    //freopen(TASKNAME".OUT","w",stdout);
    solve();
}

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