OJ Board

Posted: **Thu Apr 09, 2009 2:01 pm**

Can anybody plz tell me whats wrong with my code????I didnt find anything wrong with output.But why wrong answer???

#include<stdio.h>
#include<string.h>

int toint(char s);
long addstr(char s[],char t[]);

int main(void)
{
char s[100];
char t[100];
int i;
long result;

while(scanf("%s %s",s,t)==2)
{
if((strlen(s)==1 && strlen(t)==1) && (s[0]=='0'&&t[0]=='0'))
break;
result=addstr(s,t);

if(result==0)
printf("No carry operation.\n");
else
printf("%ld carry operations.\n",result);

for(i=0;i<100;i++)
{
s=t='\0';
}
}
return 0;
}

long addstr(char s[],char t[])
{
long lenS,lenT,carry,carry_count,i,j,temp,temp1,temp2;

lenS=strlen(s);
lenT=strlen(t);

for(i=lenS-1,j=lenT-1,carry=0,carry_count=0;i>=0||j>=0;i--,j--)
{
if(carry)
++carry_count;
if(i>=0)
temp1=toint(s);
if(j>=0)
temp2=toint(t[j]);
temp=temp1+temp2+carry;
carry=temp/10;
}
while(carry!=0)
{
if(carry)
++carry_count;
carry/=10;

}
return carry_count;
}

int toint(char s)
{
return s-'0';
}

Posted: **Tue May 19, 2009 9:12 pm**

Have tested a very big amount of variants but can't still find a bug...

Please point the variant it worcs incorrectly)))

THANK YOU VERY MUCH!!!

Code: Select all

#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <string.h>

int main(void)
{
    short int t1,t2,i,j,t,S=0;
    unsigned short int k,m,z=0;
    unsigned char a=0;
    char s[25],*s1="0 0";


    FILE *fin,*fout;

    fin=fopen("in.txt","r");
    fout=fopen("out.txt","w");

    fgets(s,24,fin);
    while(strcmp(s,s1)!=0)
    {
    if (S==1) fprintf(fout,"%c",'\n');
    S=1;
    for (i=0;s[i]!=' ';i++);
    a=0;
    z=0;
    i--;
    j=strlen(s)-1-1;
    t=strlen(s)-(i+1)-1-1;
    if (i+1>t) k=i+1; else k=t;
    for (m=0;m<k;m++,i--,j--,t--)
    {
    if (i<0) t1=0;
    else t1=s[i]-48;
    if (t-1<0)t2=0;
    else t2=s[j]-48;
    if (t1+t2+a>9)
    {z++; a=1;}
    else a=0;
    }
      if (z==0) fprintf(fout,"%s","No carry operation.");
      else if (z==1) fprintf(fout,"%s","1 carry operation.");
      else fprintf(fout,"%i %s",z,"carry operations.");

      fgets(s,24,fin);

    }

    close (fin);
    close(fout);

    return 0;
}

Posted: **Thu May 21, 2009 10:46 am**

Well, this is wrong:

Code: Select all

    FILE *fin,*fout;

    fin=fopen("in.txt","r");
    fout=fopen("out.txt","w");

You're supposed to read from standard input and write to standard output. Learn about I/O redirection.

And this:

Code: Select all

        close (fin);
        close(fout);

close() closes file descriptors. For FILE* objects you must use fclose().

And this, in more ways than one:

Code: Select all

        char s[25],*s1="0 0";
...
        fgets(s,24,fin);
        while(strcmp(s,s1)!=0)

I'd use:

Code: Select all

char str1[100], str2[100];
while(scanf("%s %s", str1, str2) == 2) { ... }

And this:

Code: Select all

        if (S==1) fprintf(fout,"%c",'\n');
        S=1;

Every line of a text file, including the last one, must be terminated by '\n' on Unix systems.
'\n' is a line terminator, not delimiter as it used to be on MS-DOS.

Posted: **Mon Jun 01, 2009 8:10 am**

Thank you very much for your answer, but I've posted only here a variant with file input/output. I used stadart I/O to post the programm to judge..)) I thought it would be easier for you to test my programm with file I/O...))

Is there any found incorrect answers?

So, the variant with standart I/O:

Code: Select all

    #include <stdio.h>
    #include <stdlib.h>
    #include <math.h>
    #include <string.h>

    int main(void)
    {
        short int t1,t2,i,j,t;
        unsigned short int k,m,z=0;
        unsigned char a=0;
        char s[25],*s1="0 0";

        gets(s);
        while(strcmp(s,s1)!=0)
        {
        for (i=0;s[i]!=' ';i++);
        a=0;
        z=0;
        i--;
        j=strlen(s)-1-1;
        t=strlen(s)-(i+1)-1-1;
        if (i+1>t) k=i+1; else k=t;
        for (m=0;m<k;m++,i--,j--,t--)
        {
        if (i<0) t1=0;
        else t1=s[i]-48;
        if (t-1<0)t2=0;
        else t2=s[j]-48;
        if (t1+t2+a>9)
        {z++; a=1;}
        else a=0;
        }
          if (z==0) printf("%s","No carry operation.\n");
          else if (z==1) printf("%s","1 carry operation.\n");
          else printf("%i %s",z,"carry operations.\n");

          gets(s);

        }

      
        return 0;
    }

Posted: **Mon Jun 01, 2009 1:32 pm**

Well, when I run your code on this input:

Code: Select all

I get this output from it, which certainly doesn't look right:

Code: Select all

No carry operation.
2 carry operations.
1 carry operation.
2 carry operations.
No carry operation.
2 carry operations.
No carry operation.

(If you can't reproduce this, I'd suggest you try to compile and run your program under Linux, e.g. get Knoppix or Ubuntu livecd - they should have gcc)

Slava_Edelev wrote:I thought it would be easier for you to test my programm with file I/O...))

Nope, I find it's a lot easier when I get to specify exactly what files I want my program to read from and write to on the command line via I/O redirection, then when I have to fix hardcoded filenames in them and recompile.

Also, your code doesn't work when there are any leading whitespace, trailing whitespace or more than one space between the numbers. In most problems on this judge your programs are supposed to tolerate such extra whitespace.

else t1=s-48;

You don't have to memorize the whole ASCII table. In C/C++, character literals represent the integer ASCII value of their character, so just type '0' instead 48.

Posted: **Thu Jun 04, 2009 8:45 pm**

THANK YOU VERY MUCH!!!!!!!!!!!!! I get AC:)))))))))))))))))))
Your comments are very instructive, I know they will certainly help me also in other problems!:)
I don't know why our answers are different (but maybe it depends with

Code: Select all

t1=s[i]-48;

instead of

Code: Select all

t1=s[i]-'0'

, as you've said).

The bug in my code was connected with whitespaces, thank you very much, that you mentioned it!)))

By the way, I'm fron Russia too))) The Bonch-Bruyevich St.Petersburgh State University of Telecommunications)))

P.S.: if it is possible, could you help me with problem Bridge 10037, I've posted in the theme, but nobody answered...
http://online-judge.uva.es/board/viewto ... e377e6c499

Posted: **Wed Jul 15, 2009 2:20 pm**

can anybody help me?????This is my code below

#include<stdio.h>
#include<string.h>
int main()
{
int m,n,carry,c,i,x;
char s[10],r[10];

while(scanf("%s %s",s,r)!=EOF)
{
if(s[0]=='0' && r[0]=='0')
{
break;
}
m=strlen(s);
n=strlen(r);
if(m>n)
{
i=n;
}
else
{
i=m;
}
carry=0;
c=0;m--;n--;

for(i=i;i>=1;i--)
{
x=(s[m]-'0')+(r[n]-'0');
carry=x/10;
if(carry==1)
{
c++;
}
if(i==1 && carry==1)
{
if(m>n && s[m-1]=='9')
{
for(m=m-1;m>=0;m--)
{
x=carry+(s[m]-'0');
carry=x/10;
if(carry==0)
{
break;
}
if(carry==1)
{
c++;
}
}
}
if(n>m && r[n-1]=='9')
{
for(n=n-1;n>=0;n--)
{
x=carry+r[n]-'0';
carry=x/10;
if(carry==0)
{
break;
}
if(carry==1)
{
c++;
}
}
}
}
m--;n--;
}
if(c==0 || c==1)
{
if(c==1)
{
printf("%d carry operation.\n",c);
}
else
{
printf("No carry operation.\n");
}
}
else
{
printf("%d carry operations.\n",c);
}
}return 0;
}

Posted: **Thu Aug 13, 2009 8:03 am**

What's the problem with my following code. I am getting WA.Please help me.

Code: Select all

#include<stdio.h>

int main(){
    long m,n,i,j,c,l;

    while(scanf("%lld %lld",&m,&n)==2 && (m || n)){
        c=0;
        l=0;

        for(i=m,j=n;i!=0 || j!=0;i/=10,j/=10){
            if(i%10+j%10+c>9){
                c=1;
                l++;
            }
        }

        if(l==0) printf("No carry operation.\n",l);
        else if(l==1) printf("1 carry operation.\n");
        else printf("%lld carry operations.\n",l);
    }

    return 0;
}

Posted: **Thu Aug 13, 2009 5:19 pm**

p.cc: In function ‘int main()’:
p.cc:6: warning: format ‘%lld’ expects type ‘long long int*’, but argument 2 has type ‘long int*’
p.cc:6: warning: format ‘%lld’ expects type ‘long long int*’, but argument 3 has type ‘long int*’
p.cc:17: warning: too many arguments for format
p.cc:19: warning: format ‘%lld’ expects type ‘long long int’, but argument 2 has type ‘long int’

And you never clear the carry flag (variable c) after it is set to 1.

Posted: **Wed Nov 04, 2009 9:39 pm**

i cant find any problm of my code bt it gives WA... it seems right.. plz help..

Code: Select all

Code deleted

Posted: **Thu Nov 05, 2009 10:24 pm**

I am a new programmer. Can any 1 help me ? I am getting wa in the problem 10035 -Primary Arithmetic.
Here is my code.

Code: Select all

#include<stdio.h>
#include<cstdio>
#include<sstream>
#include<cstdlib>
#include<cctype>
#include<cmath>
using namespace std;


int ar1[11]={0},ar2[11]={0},h;

void arr1(long long x)
{
	long long b=0;
	int a,p;
	memset( ar1, 0, sizeof( ar1) );  
	
	while(x)
	{
		a=(int)x%10;
		x/=10;
		ar1[b]=a;
		b++;
		
	}
	
 	for(p=b;p<11;p++)
	{

		ar1[p]=-1;
				
	}

}


void arr2(long long y)
{
	long long d=0;
	int c;

	memset( ar2, 0, sizeof( ar2) ); 
	
	while(y)
	{
		c=(int)y%10;
		y/=10;
		ar2[d]=c;
		d++;
	
	}
	
}



int main()
{
	
	long long n,m,t,i,cry=0,h,k;

	while(scanf("%lld %lld",&n,&m)==2)
	{
	
		cry=0;
		if(n==0 && m==0)
		{
		
			break;
		}
	
		if(m>n)
		{
			t=n;
			n=m;
			m=t;
		
		}
		arr1(n);
		arr2(m);
	

		for(i=0;(ar1[i])>=0;i++)
		{
		
			if((ar1[i]+ar2[i])>=10)
			{

				cry++;
				k=1+i;
				h=ar1[k];
				
				h++;
				ar1[k]=h;
						
			}
		
		
		}
	
		
		if(cry==0)
		{
		
			printf("No carry operation.\n");
		}
		else
		{
			printf("%lld carry operations.\n",cry);
		}
	}

	return 0;
}

Posted: **Mon Apr 12, 2010 5:57 pm**

I don't know why I get wrong answer

Code: Select all

#include <iostream>
#include <algorithm>
#include <cstring>
using namespace std;

int main()
{
   int  men, i, cont=0;
   char num1[10], num2[10];
    bool carry=false;
    cin>>num1>>num2;
    while(strcmp(num1,"0")!=0 and strcmp(num2,"0")!=0)
     {
    reverse(num1, num1+strlen(num1));
    reverse(num2, num2+strlen(num2));
    if(strlen(num1)>strlen(num2))
    men=strlen(num2);
    else
    men=strlen(num1);

    for(i=0; i<men; i++)
    {
      if(carry==true)
      {if(((num1[i]-48)+(num2[i]-48))+1>9)
      {
      carry=true;
      cont++;
      }
      else
      carry=false;
      }
      else
      {
      if(((num1[i]-48)+(num2[i]-48))>9)
      {carry=true;
      cont++;
      }
      }

    }
    if(cont==0)
    cout<<"No carry operation."<<endl;
    else if(cont==1)
    cout<<"1 carry operation."<<endl;
    else
    cout<<cont<<" carry operations."<<endl;
    cont=0;
    carry=false;

cin>>num1>>num2;
    }
        return 0;
}

Posted: **Sun Jul 04, 2010 11:24 am**

can anyone please help me with the code below..
i can't understand why am i getting WA

//primary arithmetic
#include <stdio.h>

int main()
{
unsigned long int a,b;
int carry;

while(scanf("%lu %lu",&a,&b)==2)
{
if(a==0 && b==0)
break;

carry=0;

while((a%10)||(b%10))
{
if((a%10+b%10)>9)
carry++;
a/=10;
b/=10;
}
if(carry==0)
printf("No carry operation.\n");
else if(carry==1)
printf("%d carry operation.\n",carry);
else
printf("%d carry operations.\n",carry);
}
return 0;
}

Posted: **Sun Jul 04, 2010 10:48 pm**

13 pages of discussions here: http://acm.uva.es/board/viewtopic.php?f=9&t=4057
Another reminder: Don't create a new thread for a problem that already exists! Make your post in an existing thread.

Posted: **Wed Sep 22, 2010 7:11 pm**

Please help me. My program is not give right ans.[code#include<stdio.h>
int main()
{
long int n,m,a[100]={0},b[100]={0},i,h,c,d,t,r,k,l=1;
while(scanf("%ld%ld",&n,&m)!=EOF)
{
if(n==0&&m==0)
break;
c=0;
for(i=0;n!=0;i++)
{
a=n%10;
n=n/10;
c=c+1;
}
d=0;
for(i=0;m!=0;i++)
{
b=m%10;
m=m/10;
d=d+1;
}
if(c>d)
t=c;
else
t=d;
h=0;
k=0;
for(i=0;i<t;i++)
{
r=0;
r=a+b+k;
if(r>9)
{
h=h+1;
k=1;
}
}
if(h==0)
printf("No carry operation.\n");
else
if(h==1)
printf("1 carry operation.\n");
else
printf("%ld carry operations.\n",h);
}

return 0;
}][/code]

OJ Board

10035 - Primary Arithmetic

why wrong answer????

Re: 10035 - Primary Arithmetic

Re: 10035 - Primary Arithmetic

Re: 10035 - Primary Arithmetic

Re: 10035 - Primary Arithmetic

Re: 10035 - Primary Arithmetic

10035 - Primary Arithmetic

10035 - Primary Arithmetic

Re: 10035 - Primary Arithmetic

Re: 10035 - Primary Arithmetic

Re: 10035 - Primary Arithmetic

Re: 10035 - Primary Arithmetic

10035 - primary arithmetic

Re: 10035 - primary arithmetic

Re: 10035 - primary arithmetic