10963 - The Swallowing Ground

[salous]

Can someone please help me with this problem? This should be a very easy one but I just don't understand why can't I get it right, I have read all the threads about this problem and tried lots of attempts but still no luck. Can you please help me point out what's wrong with my code? Thanks a lot!

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

int main(void) {
	int dataNum = 0;
	scanf("%d", &dataNum);
	int i = 0;
	for(i = 0; i < dataNum; ++i) {
		int columnNum = 0;
		scanf("%d", &columnNum);
		int ableToFix = 1;
		if(columnNum < 0)
			ableToFix = -1;
		int diff = -1;
		int j = 0;
		for(j = 0; j < columnNum; ++j) {
			int y1, y2;
			y1 = y2 = 0;
			scanf("%d%d", &y1, &y2);
			if(ableToFix == 1) {
				int diffTemp = abs(y1 - y2);
				if(diff == -1)
					diff = diffTemp;
				else if(diff != diffTemp)
					ableToFix = -1;
			}
		}
		if(ableToFix == 1)
			printf("yes\n\n");
		else
			printf("no\n\n");
	}
}

[jurajz]

Hi salous!

I solved this problem in the same way, as you, and I have AC. I think, that I found your little mistake. In new system, if you print extra blank line, the judge will give probably WA instead PE. I wrote about this in this thread:

http://online-judge.uva.es/board/viewtopic.php?t=22134

For this problem, the problem description says:

The outputs of two consecutive cases will be separated by a blank line.

And there is probably a mistake in your code, consecutive means, that blank line is "After each test case except last" or "Before each test case except first". And you write a blank line after each test case, including the last. Make something with this and I hope, that you will get AC

[DD]

In this problem, you can assume that the row of the northern block is bigger than the row of the southern block. Of course you also need to take care about the multi-case input.

[f.maru]

can sb help me i get Wa

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#include<iostream>
#include<cmath>
using namespace std;
int main()
{
    int n,y1,y2,q,tes;
    bool flag=false;
    cin>>tes;
    int ms;
    for(int j=2;j<=tes;j++)
    {
    cout<<endl;
    cin>>n;
    for(int t=1;t<=n;t++)
    {
     
            cin>>y1>>y2;
            q=abs(y1-y2);
            if (t==1)
            ms=q;
            if (q!=ms)flag=true;
    }
    if(flag==true)cout<<"no"<<endl;
    else
    cout<<"yes"<<endl;
}
}

[brianfry713]

Try running your code on the sample input.

[f.maru]

i tried sample and i got correct answer
this is my new code i still don't know what to do if someone can help me

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#include<iostream>
#include<cmath>
using namespace std;
int main()
{
    int n,y1,y2,q,tes;
    bool flag=false;
    cin>>tes;
    int ms;
    for(int j=1;j<=tes;j++)
    {
    cout<<endl;
    cin>>n;
    for(int t=1;t<=n;t++)
    {
     
            cin>>y1>>y2;
            q=y1-y2;
            if (t==1)
            ms=q;
            if (q!=ms)flag=true;
    }
    if(j>1)
    cout<<endl;
    if(flag==true)cout<<"no"<<endl;
    else
    cout<<"yes"<<endl;
}
}

[brianfry713]

Don't print a blank line at the start of the output.

[f.maru]

You ean don't use cout<<endl before cin>>n in the for?
I tried this but I got WA.
And I think I have to seperate output with bank line except first output like leap year...

[brianfry713]

The outputs of two consecutive cases will be separated by a blank line.
Input:

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2

5
2 1
0 -1
1 0
1 0
2 1

5
2 1
0 -1
1 0
1 0
2 1

Correct output:

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yes

yes

[f.maru]

Sry but I had submitted my code without printing blank line befor reading n but I got WA and it the output is same as what wrote

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#include<iostream>
#include<cmath>
using namespace std;
int main()
{
    int n,y1,y2,q,tes;
    bool flag=false;
    cin>>tes;
    int ms;
    for(int j=1;j<=tes;j++)
    {
    cin>>n;
    for(int t=1;t<=n;t++)
    {
     
            cin>>y1>>y2;
            q=y1-y2;
            if (t==1)
            ms=q;
            if (q!=ms)flag=true;
    }
    if(j>1)
    cout<<endl;
    if(flag==true)cout<<"no"<<endl;
    else
    cout<<"yes"<<endl;
}
}

[brianfry713]

You need to reset flag to false at the start of each test case.

[Samleo]

Why is my code getting WA? I am printing the lines properly, have passed all test inputs on the forum.. But still WA

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CODE REMOVED AFTER AC

Would appreciate some help and test inputs
Thanks,
Sam

[brianfry713]

Either don't use abs or make your abs function return something.

[Samleo]

Either don't use abs or make your abs function return something.

Thanks Solved with that tip Stupid mistake

[NickStern]

I keep getting WA for this problem but it responds fine to all the test cases I have given it. Could someone tell me the issue with my code? Unlike most of the other posts it is in java.

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Issue resolved