31 lines
799 B
Java
31 lines
799 B
Java
package com.thinker.bishi.offer;
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/**
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* @author lzh
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*/
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public class EqualCount {
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private static int count = 0;
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private static int realResult = 6;
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public static void go(int[] opts,int result,int current,String sym){
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if(current >= opts.length-1) {
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if(result == EqualCount.realResult)
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count += 1;
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return;
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}
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if("+".equals(sym))
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result += opts[current];
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if("-".equals(sym))
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result -= opts[current];
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go(opts, result, current+1, "+");
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go(opts, result, current+1, "-");
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}
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public static void main(String[] args) {
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int opts[] = new int[]{1,2,3,4,5,6,7,8,9};
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go(opts,opts[0],1,"+");
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go(opts,opts[0],1,"-");
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System.out.println(count);
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}
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}
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