北京大学 计算概论2010(医学部)-罗英伟 模拟考试1 答案

//1

#include

int main()

{

int a,b;

scanf("%d%d",&a,&b);

printf("%.3f%%\n",(float)b/a*100); return 0;

}

//2

#include

int main()

{

int n;

scanf("%d",&n);

char name[9];

float t;

int cough,i,sum=0;

for (i=1; i<=n; i++)

{

scanf("%s%f%d",name,&t,&cough);

if (t>=37.5 && cough==1)

{

printf("%s\n",name);

sum++;

}

}

printf("%d\n",sum);

return 0;

}

//3

#include

int main()

{

int n;

scanf("%d",&n);

int i,a,b;

scanf("%d%d",&a,&b);

double c=(double)b/a;

for (i=1; i

{

scanf("%d%d",&a,&b);

double d=(double)b/a;

double t=d-c;

if (t>0.05) printf("better\n");

else if (t<-0.05) printf("worse\n");

else printf("same\n");

}

return 0;

}

//4

#include

int main()

{

int m;

scanf("%d",&m);

int n[1000];

int i,max=0;

for (i=0; i

{

scanf("%d",&n[i]);

if (n[i]>max) max=n[i];

}

double s[10000]={0};

int f1=1,f2=2,f3;

for (i=1; i<=max; i++)

{

s[i]=s[i-1]+(double)f2/f1;

f3=f1+f2;

f1=f2;

f2=f3;

}

for (i=0; i

}

//5

#include

int main()

{

int k,i;

scanf("%d",&k);

for (i=1; i<=k; i++)

{

int m,n,p,q,sum=0;

scanf("%d%d",&m,&n);

for (p=0; p

for (q=0; q

{

int tmp;

scanf("%d",&tmp);

if (p==0 || p==m-1 || q==0 || q==n-1) sum+=tmp; }

printf("%d\n",sum);

}

return 0;

}

//6

#include

int main()

{

int m,i;

scanf("%d",&m);

for (i=0; i

{

int n,s[500];

scanf("%d",&n);

int j;

for (j=0; j

int k,F=0;

int p[500]={0};

for (j=0; j

{

if (p[j]==-1) continue;

for (k=j+1; k

if (s[j]==s[k]) {p[j]=1; p[k]=-1;}

if (p[j]==1)

if (F==0) F=1;

else

{

F=2;

printf("%d\n",s[j]);

break;

}

}

if (F<2) printf("NOT EXIST\n");

}

return 0;

}

//7

#include

#include

#include

int main()

{

int n;

char str[100];

gets(str);

n=atoi(str);

int i;

for (i=0; i

{

int num[26]={0};

char word[256];

gets(word);

int len=strlen(word);

int j;

for (j=0; j

{

if (word[j]>='A' && word[j]<='Z') num[word[j]-65]++; if (word[j]>='a' && word[j]<='z') num[word[j]-97]++; }

int max=0;

for (j=0;j<26;j++) if (num[j]>max) max=num[j];

for (j=0;j<26;j++) if (num[j]==max) printf("%c",j+97); printf("\n");

}

return 0;

}

//8

#include

#define MAXNUM 1000000

char p[MAXNUM]={0};

int prime[MAXNUM/2];

int N;

int main()

{

int i,j;

for (i=2; i<=MAXNUM/2; i++)

if (p[i]==0) for (j=2; j<=MAXNUM/i; j++) p[j*i]=1;

N=-1;

for (i=2; i<=MAXNUM; i++)

if (p[i]==0)

{

N++;

prime[N]=i;

}

int n;

scanf("%d",&n);

for (i=0; i

{

int num;

scanf("%d",&num);

if (p[num]==0) printf("%d=%d\n",num,num);

else

{

printf("%d=",num);

for (j=0; j<=N; j++)

{

while (num%prime[j]==0)

{

printf("%d",prime[j]);

num=num/prime[j];

if (num>1) printf("*");

}

if (num==1)

{

printf("\n");

break;

}

}

}

}

return 0;

}

//9

#include

#include

int main()

{

char s[10000];

gets(s);

int len=strlen(s);

char word[100][51];

int i,j,Nword=0;

for (i=0; i

if (s[i]!=' ')

{

Nword++;

int Lword=0;

while (s[i+Lword]!=' ' && s[i+Lword]!='\0')

{

word[Nword-1][Lword]=s[i+Lword];

Lword++;

}

word[Nword-1][Lword]='\0';

i+=Lword;

}

for (i=0; i

for (j=i+1; j

if (strcmp(word[i],word[j])>0)

{

char t[51];

strcpy(t,word[i]);

strcpy(word[i],word[j]);

strcpy(word[j],t);

}

for (i=0; i

{

printf("%s\n",word[i]);

while (i

return 0;

}