Submission #997761

#	Time	Username	Problem	Language	Result	Execution time	Memory
997761		MarwenElarbi	Genetics (BOI18_genetics)	C++17	100 / 100	1925 ms	56120 KiB

genetics

#include <bits/stdc++.h>
using namespace std;
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#pragma GCC target("avx2")
#define fi first
#define se second
#define ll long long
#define pb push_back
#define ii pair<int,int>
const int nax=4100;
vector<bitset<nax*4>> b (nax);
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
int main(){
    int n,m,k;
    cin>>n>>m>>k;
    string tab[n];
    vector<int> per(n);
    for (int i = 0; i < n; ++i)
    {
        per[i]=i;
        cin>>tab[i];
        for (int j = 0; j < m; ++j)
        {
            if(tab[i][j]=='A') b[i][j*4]=1;
            else if(tab[i][j]=='C') b[i][j*4+1]=1;
            else if(tab[i][j]=='T') b[i][j*4+2]=1;
            else b[i][j*4+3]=1;
        }
    }
    bool vis[n];
    memset(vis,0,sizeof vis);
    int cnt=0;
    for (int i = 0; i < n; ++i)
    {
        if(vis[i]==1) continue;
        shuffle(per.begin(),per.end(),rng);
        for (int j = 0; j < n; ++j)
        {
            if(per[j]==i) continue;
            auto cnt=b[i]^b[per[j]];
            int cur=cnt.count();
            //cout <<i<<" "<<j<<" "<<cur<<endl;
            if(cur/2!=k){
                vis[per[j]]=1;
                vis[i]=1;
                break;
            }
        }
        if(vis[i]==0){
            cout <<i+1<<endl;
            return 0;
        }
    }
}

Compilation message (stderr)

genetics.cpp: In function 'int main()':
genetics.cpp:33:9: warning: unused variable 'cnt' [-Wunused-variable]
   33 |     int cnt=0;
      |         ^~~
In file included from /usr/include/string.h:495,
                 from /usr/include/c++/10/cstring:42,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:48,
                 from genetics.cpp:1:
In function 'void* memset(void*, int, size_t)',
    inlined from 'int main()' at genetics.cpp:32:11:
/usr/include/x86_64-linux-gnu/bits/string_fortified.h:71:33: warning: 'void* __builtin_memset(void*, int, long unsigned int)' specified size between 18446744071562067968 and 18446744073709551615 exceeds maximum object size 9223372036854775807 [-Wstringop-overflow=]
   71 |   return __builtin___memset_chk (__dest, __ch, __len, __bos0 (__dest));
      |          ~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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