268. Missing Number
2018-03-16 20:28
302 查看
求缺失的数字:
二种方法:class Solution {
public:
int missingNumber(vector<int>& nums) {
// return minus(nums);
return solve(nums);
}
int minus(vector<int>& nums)
{
int res=0;
int sum=nums.size()*(nums.size()+1)/2;
for(int i=0;i<nums.size();i++)
{
res+=nums[i];
}
return sum-res;
}
int solve(vector<int>& nums)
{
int res=nums.size();
for(int i=0;i<nums.size();i++)
{
res^=(nums[i]^i);
}
return res;
}
};
二种方法:class Solution {
public:
int missingNumber(vector<int>& nums) {
// return minus(nums);
return solve(nums);
}
int minus(vector<int>& nums)
{
int res=0;
int sum=nums.size()*(nums.size()+1)/2;
for(int i=0;i<nums.size();i++)
{
res+=nums[i];
}
return sum-res;
}
int solve(vector<int>& nums)
{
int res=nums.size();
for(int i=0;i<nums.size();i++)
{
res^=(nums[i]^i);
}
return res;
}
};
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