26 lines
486 B
Java
26 lines
486 B
Java
/*
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* @lc app=leetcode id=367 lang=java
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*
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* [367] Valid Perfect Square
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*/
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// @lc code=start
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class Solution {
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public boolean isPerfectSquare(int num) {
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long i = 0, j = num, m;
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while(i <= j) {
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m = i + (j-i)/2;
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if(m * m == num) {
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return true;
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} else if(m * m <num) {
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i = m + 1;
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} else {
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j = m - 1;
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}
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}
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return false;
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}
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}
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// @lc code=end
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