Submission #419768

#TimeUsernameProblemLanguageResultExecution timeMemory
419768KerimGroup Photo (JOI21_ho_t3)C++17
64 / 100
5079 ms665220 KiB
#include "bits/stdc++.h" #define MAXN 100009 #define INF 1000000007 #define mp(x,y) make_pair(x,y) #define all(v) v.begin(),v.end() #define pb(x) push_back(x) #define wr cout<<"----------------"<<endl; #define ppb() pop_back() #define tr(ii,c) for(__typeof((c).begin()) ii=(c).begin();ii!=(c).end();ii++) #define ff first #define ss second #define my_little_dodge 46 #define debug(x) cerr<< #x <<" = "<< x<<endl; using namespace std; typedef long long ll; typedef pair<int,int> PII; template<class T>bool umin(T& a,T b){if(a>b){a=b;return 1;}return 0;} template<class T>bool umax(T& a,T b){if(a<b){a=b;return 1;}return 0;} const int N=5002; int n,arr[N],inv[N][N],dp[N][N],odp[N][N]; int F[N][N],AB[N][N],BA[N][N],par[N][N],G[N][N]; int g(int x,int y){ if(x>=y)return 0; if(~odp[x][y])return odp[x][y]; return odp[x][y]=g(x,y-1)+par[y][y]-par[x-1][y]; } int cost(int a,int b,int c){ return g(a+1,b-1)+F[a][b-1]+(BA[b][b-1]-BA[b][a])+AB[c][b]; } int main(){ //freopen("file.in", "r", stdin); memset(odp,-1,sizeof odp); scanf("%d",&n); for(int i=1;i<=n;i++)scanf("%d",arr+i); for(int i=2;i<=n;i++) for(int j=1;j<i;j++) inv[arr[i]][arr[j]]++; for(int i=1;i<=n;i++) for(int j=1;j<=n;j++) par[i][j]=par[i-1][j]+inv[j][i]; for(int z=1;z<=n;z++) for(int x=1;x<=n;x++) G[x][z]=G[x-1][z]+inv[x][z]; for(int y=1;y<=n;y++) for(int z=y+1;z<=n;z++) F[y][z]=F[y][z-1]+G[y][z]; for(int i=1;i<=n;i++) for(int j=1;j<=n;j++){ BA[i][j]=BA[i][j-1]+inv[i][j]; AB[i][j]=AB[i][j-1]+inv[j][i]; } int ret; for(int a=n;a>=0;a--) for(int b=a+1;b<=n;b++){ if(b==n){ dp[a][b]=cost(a,b,0); continue; } ret=INF; for(int i=b+1;i<=n;i++) umin(ret,dp[b][i]+cost(a,b,i)); dp[a][b]=ret; } int ans=INF; for(int i=1;i<=n;i++) umin(ans,dp[0][i]); printf("%d\n",ans); return 0; }

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:34:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   34 |  scanf("%d",&n);
      |  ~~~~~^~~~~~~~~
Main.cpp:35:28: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   35 |  for(int i=1;i<=n;i++)scanf("%d",arr+i);
      |                       ~~~~~^~~~~~~~~~~~
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