Submission #213441

#	Time	Username	Problem	Language	Result	Execution time	Memory
213441		MKopchev	Genetics (BOI18_genetics)	C++14	100 / 100	1423 ms	54396 KiB

genetics

#include<bits/stdc++.h>
using namespace std;
const int nmax=4100+42,SZ=16,LIM=1<<SZ;
int n,m,k;
char inp[nmax][nmax];

char in()
{
    char c=getchar();
    while(c!='A'&&c!='C'&&c!='G'&&c!='T')c=getchar();
    return c;
}

int seen[4][nmax];
int hsh(char c)
{
    if(c=='A')return 0;
    if(c=='C')return 1;
    if(c=='G')return 2;
    return 3;
}

unsigned int hsh_values[nmax][nmax];

int bits_in[LIM];

int ask(unsigned int val)
{
    return bits_in[val/LIM]+bits_in[val%LIM];
}
void test(int bad)
{
    for(int i=1;i<=n;i++)
        if(i!=bad)
        {
            int diff=0;
            for(int j=0;j<=m/SZ;j++)
                diff=diff+ask(hsh_values[i][j]^hsh_values[bad][j]);
            if(diff!=k)return;
        }
    printf("%i\n",bad);
    exit(0);
}
int main()
{
    scanf("%i%i%i",&n,&m,&k);

    for(int i=1;i<=n;i++)
        for(int j=1;j<=m;j++)
            inp[i][j]=in();

    for(int i=1;i<=n;i++)
        for(int j=1;j<=m;j++)
        {
            seen[hsh(inp[i][j])][j]++;
            hsh_values[i][j/SZ]=hsh_values[i][j/SZ]*4+hsh(inp[i][j]);
        }

    for(int i=0;i<LIM;i++)
    {
        int i_=i;
        while(i_)
        {
            bits_in[i]+=(i_%4!=0);
            i_=i_/4;
        }
    }
    for(int i=1;i<=n;i++)
    {
        int total_diff=0;
        for(int j=1;j<=m;j++)
            total_diff+=seen[0][j]+seen[1][j]+seen[2][j]+seen[3][j]-seen[hsh(inp[i][j])][j];

        if(total_diff==k*(n-1))test(i);
    }

    return 0;
}

Compilation message (stderr)

genetics.cpp: In function 'int main()':
genetics.cpp:46:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%i%i%i",&n,&m,&k);
     ~~~~~^~~~~~~~~~~~~~~~~~~

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