Submission #130082

#	Time	Username	Problem	Language	Result	Execution time	Memory
130082		TadijaSebez	Genetics (BOI18_genetics)	C++11	100 / 100	1080 ms	84476 KiB

genetics

#include <stdio.h>
#include <stdlib.h>
#include <ctime>
const int N=4115;
int my[N],sz[2],cnt[2][4][N];
char s[N][N];
int val[N][N];
bool ok[N];
int oks;
void Try(int n, int m, int k)
{
	int i,j;
	for(j=1;j<=m;j++) for(i=0;i<4;i++) cnt[0][i][j]=cnt[1][i][j]=0;
	sz[0]=sz[1]=0;
	for(i=1;i<=n;i++)
	{
		my[i]=rand()&1;
		sz[my[i]]++;
		for(j=1;j<=m;j++) cnt[my[i]][val[i][j]][j]++;
	}
	for(i=1;i<=n;i++)
	{
		if(ok[i])
		{
			int po[2];
			po[0]=po[1]=0;
			for(j=1;j<=m;j++)
			{
				po[0]+=sz[0]-cnt[0][val[i][j]][j];
				po[1]+=sz[1]-cnt[1][val[i][j]][j];
			}
			sz[my[i]]--;
			if(po[0]!=sz[0]*k) ok[i]=0,oks--;
			else if(po[1]!=sz[1]*k) ok[i]=0,oks--;
			sz[my[i]]++;
		}
	}
}
int main()
{
	srand(time(0));
	int n,m,k,i,j;
	scanf("%i %i %i",&n,&m,&k);
	for(i=1;i<=n;i++) scanf("%s",s[i]+1),ok[i]=1;
	for(i=1;i<=n;i++) for(j=1;j<=m;j++)
	{
		if(s[i][j]=='A') val[i][j]=0;
		if(s[i][j]=='C') val[i][j]=1;
		if(s[i][j]=='G') val[i][j]=2;
		if(s[i][j]=='T') val[i][j]=3;
	}
	oks=n;
	while(oks>1) Try(n,m,k);
	int ans=0;
	for(i=1;i<=n;i++) if(ok[i]) ans=i;
	printf("%i\n",ans);
	return 0;
}

Compilation message (stderr)

genetics.cpp: In function 'int main()':
genetics.cpp:43:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%i %i %i",&n,&m,&k);
  ~~~~~^~~~~~~~~~~~~~~~~~~~~
genetics.cpp:44:38: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  for(i=1;i<=n;i++) scanf("%s",s[i]+1),ok[i]=1;
                    ~~~~~~~~~~~~~~~~~~^~~~~~~~

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