2769. Jumping Jack
2769. Jumping Jack
time limit per test
1 second
memory limit per test
64 megabytes
input
standard input
output
standard output
Jack is working on his jumping skills recently. Currently he's located at point zero of the number line. He would like to get to the point x. In order to train, he has decided that he'll first jump by only one unit, and each subsequent jump will be exactly one longer than the previous one. He can go either left or right with each jump. He wonders how many jumps he needs to reach x.
Input
The input data consists of only one integer x (-109≤x≤109).
Output
Output the minimal number of jumps that Jack requires to reach x.
Examples
Input
2
Output
3
Input
6
Output
3
Input
0
Output
0
#include
using namespace std;
int main()
{
long long x;
scanf("%lld",&x);
if(x<0)x=-x;
int res = 0;
int tot = 0;
while(tot ----------------------------------------------------------------
#include
#include
#include
#include
using namespace std;
int main(){
long long a, b;
scanf("%lld", &a);
a = abs(a);
b = (-1 + sqrt(1+8 * a)) / 2; //第多少次跳跃
long long h = (1 + b) * b / 2; // 求和
if(h == a){
printf("%lld\n", b);
}
else{
long long e = a - h;
e = b + 1 - e;
b++;
if(e % 2 == 0){
printf("%lld\n", b);
}
else if((e + b + 1) % 2 == 0){
printf("%lld\n", b+1);
}
else{
printf("%lld\n", b+2);
}
}
return 0;
}