problem
Given a non-negative integer c, your task is to decide whether there’re two integers a and b such that a2 + b2 = c.
Example 1:
Input: 5
Output: True
Explanation: 1 * 1 + 2 * 2 = 5
Example 2:
Input: 3
Output: False
solution
class Solution {
public boolean judgeSquareSum(int c) {
int i=0,j=(int)Math.sqrt(c);
while (i<=j){
int t=i*i+j*j;
if(t==c){
return true;
}else if(t<c){
i++;
}else {
j--;
}
}
return false;
}
}