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【USACO 1.3】Combination Lock

 

/*TASK:comboLANG:C++URL:http://train.usaco.org/usacoprob2?a=E6RZnAhV9zn&S=comboSOLVE:自己做,想的是5*5*5*2-重复计算的。官方题解是超级简单地写个判断枚举每一种解是否可行(n^3),题目没给n的范围,我就认为不可以用O(n^3)的算法。*/#include <iostream>#include <algorithm>#include <cstdio>#include <cstring>#define ll long longusing namespace std;int n,a[30][40];ll ans=1;int main() {	freopen("combo.in","r",stdin);	freopen("combo.out","w",stdout);	scanf("%d",&n);	for(int i=1;i<=2;i++)	for(int j=1;j<=3;j++)		scanf("%d",&a[i][j]);	ll s=min(5,n);	if(n<=5)ans=s*s*s;	else	for(int j=1;j<=3;j++)		ans*=s-min(s,(ll)min(abs(a[1][j]-a[2][j]),n-abs(a[1][j]-a[2][j])));		printf("%lld\n",s*s*s*2-ans);}

  

【USACO 1.3】Combination Lock