Elevator trouble

[rols]

If someone has time to figure out where i made a mistake, i would be very grateful (:

#include "stdio.h"
int zajednicki(int a, int b){
	int k,s;
	if(a>b) {a+=b;b=a-b;a-=b;}
	for(k=1;k<=a;k++) if(!((a%k)||(b%k))) s=k;
	return s;
}
int main(void){
	int floor,start,goal,up,down,counter=0,p=0;
	scanf("%d %d %d %d %d",&floor,&start,&goal,&up,&down);
	if((goal-start)%zajednicki(up,down)) {printf("use the stairs");return 0;}
	while(start!=goal){
		if(p) {printf("use the stairs");return 0;}
		p=1;
		if(goal>start) 
			if(start+up<=floor) {start+=up;p--;}
			else if(start-down>0) {start-=down;p--;} else;
		else
			if(start-down>0) {start-=down;p--;}
			else if(start+up<=floor) {start+=up;p--;}
		if(!p) counter++;
	}
	printf("\n%d",counter);
return 0;
}

[leppyr64]

The elevator has a bottom and a top. There are important rules about that.

[rols]

well, the IF statements ( if start+up<=floor and if start-down>0) handle that

[leppyr64]

4 floors
Start on 1 go to 2
Up 4
Down 2
Possible in 2 moves.

[rols]

if my maths is right, 1+4=5,and there are 4 floors

[leppyr64]

Sorry. I confused this with another problem where the elevator will go up but stop at the last floor. My apologies.

[rols]

no p. , thanks for helping if you have time, check this problem too...

[leppyr64]

Output should always end with '\n'.

Your code after changing that returns TLE for me. Please don't double post.

[rols]

i changed that, printf("use the stairs") to printf("\nuse the stairs\n") and printf("\n%d",counter) to printf("\n%d\n",counter) and i still get WA

[leppyr64]

Don't lead with '\n' either

[rols]

printf("use the stairs\n") , printf("%d\n",counter) , still doesn't work

[leppyr64]

Please post your updated code.

[rols]

#include "stdio.h"
int zajednicki(int a, int b){
	int k,s;
	if(a>b) {a+=b;b=a-b;a-=b;}
	for(k=1;k<=a;k++) if(!((a%k)||(b%k))) s=k;
	return s;
}
int main(void){
	int floor,start,goal,up,down,counter=0,p=0;
	scanf("%d %d %d %d %d",&floor,&start,&goal,&up,&down);
	if(((goal-start)%zajednicki(up,down))!=0) {printf("use the stairs\n");return 0;}
	while(start!=goal){
		if(p) {printf("use the stairs\n");return 0;}
		p=1;
		if(goal>start) 
			if(start+up<=floor) {start+=up;p--;}
			else if(start-down>0) {start-=down;p--;} else;
		else
			if(start-down>0) {start-=down;p--;}
			else if(start+up<=floor) {start+=up;p--;}
		if(!p) counter++;
	}
	printf("%d\n",counter);
return 0;
}

[leppyr64]

Does modulo work as expected with negative numbers?

[rols]

it doesn't matter, it just matters if it is 0 or something else.. so YES, it is working as expected