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import java.util.Stack;

/**
 * https://leetcode.cn/problems/basic-calculator/
 * 
 *  s 
 * : eval() 
 * 
 *  1
 * s = "1 + 1"
 * 2
 * 
 *  2
 * s = " 2-1 + 2 "
 * 3
 * 
 *  3
 * s = "(1+(4+5+2)-3)+(6+8)"
 * 23
 * 
 * 
 * - 1
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