PAT (Advanced Level) 1048. Find Coins (25)
先对序列排序,然后枚举较小值,二分较大值。
#include<iostream>
#include<cstring>
#include<cmath>
#include<algorithm>
#include<cstdio>
#include<map>
#include<queue>
#include<string>
#include<vector>
using namespace std; const int maxn=+;
int a[maxn];
int n,k; int main()
{
scanf("%d%d",&n,&k);
for(int i=;i<=n;i++) scanf("%d",&a[i]);
sort(a+,a++n);
int Find=;
for(int i=;i<=n;i++)
{
int l=i+,r=n;
while(l<=r)
{
int mid=(l+r)/;
if(a[mid]>k-a[i]) r=mid-;
else if(a[mid]<k-a[i]) l=mid+;
else {Find=;break;}
}
if(Find==)
{
printf("%d %d\n",a[i],k-a[i]);
break;
}
}
if(Find==) printf("No Solution\n");
return ;
}
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