Submission #997753

#	Time	Username	Problem	Language	Result	Execution time	Memory
997753		MarwenElarbi	Genetics (BOI18_genetics)	C++17	74 / 100	1767 ms	47188 KiB

genetics

#include <bits/stdc++.h>
using namespace std;
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#define fi first
#define se second
#define ll long long
#define pb push_back
#define ii pair<int,int>
const int nax=4100;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
int main(){
    int n,m,k;
    cin>>n>>m>>k;
    if(n<=100){
        string tab[n];
        vector<int> per(n);
        for (int i = 0; i < n; ++i)
        {
            per[i]=i;
            cin>>tab[i];
        }
        //shuffle(per.begin(),per.end(),rng);
        bool vis[n];
        memset(vis,0,sizeof vis);
        //int cnt=0;
        for (int i = 0; i < n; ++i)
        {
            //if(vis[i]) continue;
            //if(cnt>10) break;
            //cnt++;
            bool test=true;
            for (int j = 0; j < n; ++j)
            {
                //if(vis[j]||j==i) continue;
                if(i==j) continue;
                int cur=0;
                for (int t = 0; t < m; ++t)
                {
                    if(tab[i][t]!=tab[j][t]) cur++;
                    if(cur>k) break;
                }
                if(cur!=k){
                    test=false;
                }
            }
            if(test){
                cout <<i+1<<endl;
                return 0;
            }
        }
        for (int i = 0; i < n; ++i)
        {
            if(vis[i]==0){
                cout <<i+1<<endl;
                break;
            }
        }
    }else{
        string tab[n];
        vector<bitset<nax>> b(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]=1;
                else b[i][j]=0;
            }
        }
        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();
                if(cur!=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:75:13: warning: unused variable 'cnt' [-Wunused-variable]
   75 |         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:25:15:
/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: 0 / 26