标签:func return -- 个数 int sof microsoft begin using
题目:有n个数,两两组成二元组,相差最小的有多少对呢?相差最大呢?
例如 ar[] = {1,3,4,9},返回 1 1
br[] = {1,2,3,10,12,21},返回 2 1
我的思路是将元素两两做差,将差值保存在一个数组内,把数组进行排序,即可找出最小差值多少个,最大差值多少个。(看起来我的时间空间复杂度低不了)
#include<iostream>
#include<algorithm>
#include<vector>
using namespace std;
void func(int n, int ar[], int br[])
{
int size = (n*n-n)/2;
vector<int> vec;
for(int i=0; i<n-1; ++i)
{
for(int j=i+1; j<n; ++j)
{
if(ar[i]>ar[j])
vec.push_back(ar[i]-ar[j]);
else
vec.push_back(ar[j]-ar[i]);
}
}
sort(vec.begin(), vec.end());
for(auto i=vec.begin(); i!=vec.end(); ++i)
cout<<*i<<" ";
cout<<endl;
cout<<"vec.size() = "<<vec.size()<<endl;
if(vec[0] != vec[size-1])
{
int min = 0, max = 0;
int i = 0;
while(vec[i] == *vec.begin())
{++min;++i;}
i = size-1;
while(vec[i] == vec[size-1])
{++max; --i;}
br[0] = min;
br[1] = max;
return;
}
br[0] = size;
br[1] = size;
return;
}
int main()
{
int ar[] = {1,2,3,4,5,6,7,8,9,0,234, -132, 354325, 52354, 123}, br[2]={0};
func(sizeof(ar)/sizeof(ar[0]), ar, br);
cout<<br[0]<<" "<<br[1]<<endl;
return 0;
}
运行结果
因该还有更好地思路来节省空间时间
于是我换了一种思路,在每次拿到差值的时候就比较它是不是最大或最小值,是就计数,不是就跳过得到下面的算法
#include<iostream>
#include<algorithm>
#include<vector>
using namespace std;
void func(int n, int ar[], int br[])
{
int min = -1, max = -1, maxc = 0, minc = 0, tmp = 0;
for(int i=0; i<n-1; ++i)
{
if(!i)
min = ((ar[0]-ar[1])>0 ? ar[0]-ar[1] : ar[1]-ar[0]);
for(int j=i+1; j<n; ++j)
{
tmp = ar[i]-ar[j];
if(tmp<0)
tmp = -tmp;
if(tmp<min){min=tmp;minc=1;continue;}
else if(tmp==min){++minc;continue;}
else if(tmp>max){max=tmp;maxc=1;continue;}
else if(tmp==max){++maxc;continue;}
else continue;
}
}
br[0]=minc;
br[1]=maxc;
}
int main()
{
int ar[] = {1,2,3,4,5,6,7,8,9,0,234, -132, 354325, 52354, 123}, br[2]={0};
func(sizeof(ar)/sizeof(ar[0]), ar, br);
cout<<br[0]<<" "<<br[1]<<endl;
return 0;
}
执行结果
看起来节省了空间
标签:func return -- 个数 int sof microsoft begin using
原文地址:https://www.cnblogs.com/area-h-p/p/12070620.html