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@ -922,6 +922,21 @@ public:
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## 37.85. 不用加减乘除做加法
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```cpp
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class Solution {
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public:
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int add(int num1, int num2){
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while(num2)
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{
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int sum = num1 ^ num2;//不进位
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int carray = (num1 & num2)<<1;//进位
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num1 = sum , num2 = carray;//把进位拿去加,直到加为0
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}
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return num1;//num1是答案
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}
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};
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```
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## 38.47. 二叉树中和为某一值的路径
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@ -944,13 +959,13 @@ public:
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## 40.39. 对称的二叉树
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## 41.58. 把数组排成最小的数
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## 42.38. 二叉树的镜像
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## 43.81. 扑克牌的顺子
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##
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## 44.43. 不分行从上往下打印二叉树
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## 45.45. 之字形打印二叉树
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## 46.69. 数组中数值和下标相等的元素
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## 47.24. 机器人的运动范围
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##
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## 48.25. 剪绳子
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## 49.88. 树中两个结点的最低公共祖先
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## 50.17. 从尾到头打印链表
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