10976 - Fractions Again?!

[rahurprem]

This is my code -

Code: Select all

#include<stdio.h>

int k,x,y,i;

void list()
{
	for(y=k+1; y<=200000 ; y++)
	{		
		if( k*y %(y-k))continue;
		
		x= k*y / (y-k);

		if(x<y)break;
	
		if(k*y%(x+y)==0 && ((x*y /(x+y))==k))
			printf("1/%d = 1/%d + 1/%d\n",k,x,y);
	}
}

int main()
{
	//freopen("10976.in","r",stdin);
	//freopen("10976.out","w",stdout);

	while(scanf("%d",&k)==1)
	{
		printf("%d\n",k);
		list();
	}
	return 0;
}

Please help me in getting the errors I did here.

Ashis

[Krzysztof Duleba]

I think that k * y can overflow.

[lyc]

here's my code

Code: Select all

#include<stdio.h>
int main(void){
    int n,count,x,y,i;
    int temp[10000][2];
    while(scanf("%d",&n)!=EOF){
        memset(temp,0,sizeof(temp));
        count=0;
        y=n;
        while(y++){
            if((n*y)%(y-n)!=0)continue;
            x=(n*y)/(y-n);
            if(x*y%(x+y)!=0)continue;
            if(x*y/(x+y)!=n)continue;
            temp[count][0]=x;
            temp[count++][1]=y;
            if(x==y)break;
        }
        printf("%d\n",count);
        for(i=0;i<count;i++)
            printf("1/%d = 1/%d + 1/%d\n",n,temp[i][0],temp[i][1]);
    }
}            

but..just WA
maximum of n*y = 200000000
not overflow

something wrong?

thanks

[ThanhNhan]

The output k is not the same as the input k.
You should diff your output with the sample output.

[Kaul]

My program got WA, and I'm testing many I/O.

Do you have some critical I/O?

Thx in advance!

[tan_Yui]

I solved this problem with single loop (nearly...brute force).
I think it is important to take care about the range of iteration for keeping the time limit.

Following is the my input.
I hope this helps you.

3
1
4
15
92
653
589
793
2384
626
4338
3279
502
88

Output :

2
1/3 = 1/12 + 1/4
1/3 = 1/6 + 1/6
1
1/1 = 1/2 + 1/2
3
1/4 = 1/20 + 1/5
1/4 = 1/12 + 1/6
1/4 = 1/8 + 1/8
5
1/15 = 1/240 + 1/16
1/15 = 1/90 + 1/18
1/15 = 1/60 + 1/20
1/15 = 1/40 + 1/24
1/15 = 1/30 + 1/30
8
1/92 = 1/8556 + 1/93
1/92 = 1/4324 + 1/94
1/92 = 1/2208 + 1/96
1/92 = 1/1150 + 1/100
1/92 = 1/621 + 1/108
1/92 = 1/460 + 1/115
1/92 = 1/276 + 1/138
1/92 = 1/184 + 1/184
2
1/653 = 1/427062 + 1/654
1/653 = 1/1306 + 1/1306
5
1/589 = 1/347510 + 1/590
1/589 = 1/18848 + 1/608
1/589 = 1/11780 + 1/620
1/589 = 1/1550 + 1/950
1/589 = 1/1178 + 1/1178
5
1/793 = 1/629642 + 1/794
1/793 = 1/49166 + 1/806
1/793 = 1/11102 + 1/854
1/793 = 1/4514 + 1/962
1/793 = 1/1586 + 1/1586
14
1/2384 = 1/5685840 + 1/2385
1/2384 = 1/2844112 + 1/2386
1/2384 = 1/1423248 + 1/2388
1/2384 = 1/712816 + 1/2392
1/2384 = 1/357600 + 1/2400
1/2384 = 1/179992 + 1/2416
1/2384 = 1/91188 + 1/2448
1/2384 = 1/46786 + 1/2512
1/2384 = 1/40528 + 1/2533
1/2384 = 1/24585 + 1/2640
1/2384 = 1/21456 + 1/2682
1/2384 = 1/11920 + 1/2980
1/2384 = 1/7152 + 1/3576
1/2384 = 1/4768 + 1/4768
5
1/626 = 1/392502 + 1/627
1/626 = 1/196564 + 1/628
1/626 = 1/98595 + 1/630
1/626 = 1/1878 + 1/939
1/626 = 1/1252 + 1/1252
23
1/4338 = 1/18822582 + 1/4339
1/4338 = 1/9413460 + 1/4340
1/4338 = 1/6277086 + 1/4341
1/4338 = 1/4708899 + 1/4342
1/4338 = 1/3140712 + 1/4344
1/4338 = 1/2095254 + 1/4347
1/4338 = 1/1572525 + 1/4350
1/4338 = 1/1049796 + 1/4356
1/4338 = 1/701310 + 1/4365
1/4338 = 1/527067 + 1/4374
1/4338 = 1/352824 + 1/4392
1/4338 = 1/236662 + 1/4419
1/4338 = 1/178581 + 1/4446
1/4338 = 1/120500 + 1/4500
1/4338 = 1/82422 + 1/4579
1/4338 = 1/62419 + 1/4662
1/4338 = 1/43380 + 1/4820
1/4338 = 1/30366 + 1/5061
1/4338 = 1/23859 + 1/5302
1/4338 = 1/17352 + 1/5784
1/4338 = 1/13014 + 1/6507
1/4338 = 1/10845 + 1/7230
1/4338 = 1/8676 + 1/8676
5
1/3279 = 1/10755120 + 1/3280
1/3279 = 1/3587226 + 1/3282
1/3279 = 1/1197928 + 1/3288
1/3279 = 1/13116 + 1/4372
1/3279 = 1/6558 + 1/6558
5
1/502 = 1/252506 + 1/503
1/502 = 1/126504 + 1/504
1/502 = 1/63503 + 1/506
1/502 = 1/1506 + 1/753
1/502 = 1/1004 + 1/1004
11
1/88 = 1/7832 + 1/89
1/88 = 1/3960 + 1/90
1/88 = 1/2024 + 1/92
1/88 = 1/1056 + 1/96
1/88 = 1/792 + 1/99
1/88 = 1/572 + 1/104
1/88 = 1/440 + 1/110
1/88 = 1/330 + 1/120
1/88 = 1/264 + 1/132
1/88 = 1/209 + 1/152
1/88 = 1/176 + 1/176

Best regards.

[DD]

My program got WA, and I'm testing many I/O.

Do you have some critical I/O?

Thx in advance!

Maybe you should try to show your output for some random k, and we can check that for you.

[magurmach]

Some Previous Input Output clarification:

Input:

Code: Select all

3
1
4
15
92
653
589
793
2384
626
4338
3279
502
88

Output:

Code: Select all

2
1/3 = 1/12 + 1/4
1/3 = 1/6 + 1/6
1
1/1 = 1/2 + 1/2
3
1/4 = 1/20 + 1/5
1/4 = 1/12 + 1/6
1/4 = 1/8 + 1/8
5
1/15 = 1/240 + 1/16
1/15 = 1/90 + 1/18
1/15 = 1/60 + 1/20
1/15 = 1/40 + 1/24
1/15 = 1/30 + 1/30
8
1/92 = 1/8556 + 1/93
1/92 = 1/4324 + 1/94
1/92 = 1/2208 + 1/96
1/92 = 1/1150 + 1/100
1/92 = 1/621 + 1/108
1/92 = 1/460 + 1/115
1/92 = 1/276 + 1/138
1/92 = 1/184 + 1/184
2
1/653 = 1/427062 + 1/654
1/653 = 1/1306 + 1/1306
5
1/589 = 1/347510 + 1/590
1/589 = 1/18848 + 1/608
1/589 = 1/11780 + 1/620
1/589 = 1/1550 + 1/950
1/589 = 1/1178 + 1/1178
5
1/793 = 1/629642 + 1/794
1/793 = 1/49166 + 1/806
1/793 = 1/11102 + 1/854
1/793 = 1/4514 + 1/962
1/793 = 1/1586 + 1/1586
14
1/2384 = 1/5685840 + 1/2385
1/2384 = 1/2844112 + 1/2386
1/2384 = 1/1423248 + 1/2388
1/2384 = 1/712816 + 1/2392
1/2384 = 1/357600 + 1/2400
1/2384 = 1/179992 + 1/2416
1/2384 = 1/91188 + 1/2448
1/2384 = 1/46786 + 1/2512
1/2384 = 1/40528 + 1/2533
1/2384 = 1/24585 + 1/2640
1/2384 = 1/21456 + 1/2682
1/2384 = 1/11920 + 1/2980
1/2384 = 1/7152 + 1/3576
1/2384 = 1/4768 + 1/4768
5
1/626 = 1/392502 + 1/627
1/626 = 1/196564 + 1/628
1/626 = 1/98595 + 1/630
1/626 = 1/1878 + 1/939
1/626 = 1/1252 + 1/1252
23
1/4338 = 1/18822582 + 1/4339
1/4338 = 1/9413460 + 1/4340
1/4338 = 1/6277086 + 1/4341
1/4338 = 1/4708899 + 1/4342
1/4338 = 1/3140712 + 1/4344
1/4338 = 1/2095254 + 1/4347
1/4338 = 1/1572525 + 1/4350
1/4338 = 1/1049796 + 1/4356
1/4338 = 1/701310 + 1/4365
1/4338 = 1/527067 + 1/4374
1/4338 = 1/352824 + 1/4392
1/4338 = 1/236662 + 1/4419
1/4338 = 1/178581 + 1/4446
1/4338 = 1/120500 + 1/4500
1/4338 = 1/82422 + 1/4579
1/4338 = 1/62419 + 1/4662
1/4338 = 1/43380 + 1/4820
1/4338 = 1/30366 + 1/5061
1/4338 = 1/23859 + 1/5302
1/4338 = 1/17352 + 1/5784
1/4338 = 1/13014 + 1/6507
1/4338 = 1/10845 + 1/7230
1/4338 = 1/8676 + 1/8676
5
1/3279 = 1/10755120 + 1/3280
1/3279 = 1/3587226 + 1/3282
1/3279 = 1/1197928 + 1/3288
1/3279 = 1/13116 + 1/4372
1/3279 = 1/6558 + 1/6558
5
1/502 = 1/252506 + 1/503
1/502 = 1/126504 + 1/504
1/502 = 1/63503 + 1/506
1/502 = 1/1506 + 1/753
1/502 = 1/1004 + 1/1004
11
1/88 = 1/7832 + 1/89
1/88 = 1/3960 + 1/90
1/88 = 1/2024 + 1/92
1/88 = 1/1056 + 1/96
1/88 = 1/792 + 1/99
1/88 = 1/572 + 1/104
1/88 = 1/440 + 1/110
1/88 = 1/330 + 1/120
1/88 = 1/264 + 1/132
1/88 = 1/209 + 1/152
1/88 = 1/176 + 1/176

[sidsi]

where is the problem in this code?? getting wrong answer
#include<stdio.h>
int main()
{int d[1000],e[1000],i,k;
float a,b,y;
int c;
double x;
while(scanf("%d",&k)==1)
{

a=k*2;
for( i=k+1,c=0;i<=a;i++)
{y=i;
x=(k*y)/(y-k);
if(x==(int)x)
{d[c]=(int)x,e[c]=(int)y;
c++;}
}
printf("%d\n",c);
for(i=0;i<c;i++)
printf("1/%d = 1/%d + 1/%d\n",k,d,e);
}
return 0;
}

[brianfry713]

sidsi, try solving it without using floating point.

[sidsi]

thnx, brainfry... accepted. but i dont understand the difference of using double or float in this code.
thnx again

[brianfry713]

I meant try solving it using only integers.
http://floating-point-gui.de/