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2022 Henan Mengxin League Game (5): University of Information Engineering F - Split Turf
2022-08-10 06:34:00 【WA_Automata】
F - split lawn
First you can use the interval d p dp dp 的方式,对于 d p [ i ] [ j ] dp[i][j] dp[i][j] 的求解,我们只要以 i i i, j j j 为底边,枚举顶点 k ( i < k < j ) k(i<k<j) k(i<k<j) ,Divide the triangle ( i , j , k ) (i,j,k) (i,j,k) ,Then we divide the required value into d p [ i ] [ k ] + d p [ k ] [ j ] + dp[i][k]+dp[k][j]+ dp[i][k]+dp[k][j]+ 三角形 ( i , j , k ) (i,j,k) (i,j,k) 的花费,Just find the value that costs the least.
之后可以发现,All triangles have a vertex for 1 1 1 is obviously the optimal solution,Derive the formula to get the answer
#include<bits/stdc++.h>
using namespace std;
typedef long long LL;
signed main()
{
int n;cin>>n;
LL res=0;
for(int i=3;i<=n;i++)
res+=i*(i-1);
cout<<res;
return 0;
}
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