제출 #378384

#제출 시각아이디문제언어결과실행 시간메모리
378384astoriaGroup Photo (JOI21_ho_t3)C++14
0 / 100
1 ms1260 KiB
#include "bits/stdc++.h" using namespace std; const int N=505; int n,h[N]; int mn(int i, int j){ if(i!=-1&&j!=-1) return min(i,j); else return max(i,j); } int main(){ ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL); cin>>n; for(int i=1; i<=n; i++) cin>>h[i]; h[0]=0; int ord[n+5]; for(int i=1; i<=n; i++) ord[h[i]]=i; int supp[N][N]; memset(supp,0,sizeof(supp)); for(int i=n-1; i>=1; i--){ for(int j=0; j<=h[i]; j++) supp[i][j]=supp[i][j+1]+1; for(int j=h[i]+1; j<N; j++) supp[i][j]=supp[i][j+1]; } int dp[N]; memset(dp,-1,sizeof(dp)); dp[0]=0; for(int i=1; i<=n; i++){ int trans=0; for(int j=i-1; j>=0; j--){ trans += supp[ord[j]][j]; trans -= supp[ord[j]][i]; trans -= supp[ord[j]][i]; trans += N-i; dp[i]=mn(dp[i],dp[j]+trans); } } cout<<dp[n]; }
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