Submission #521966

#	Time	Username	Problem	Language	Result	Execution time	Memory
521966		DanerZein	Discharging (NOI20_discharging)	C++14	47 / 100	1091 ms	54504 KiB

Discharging

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
const int MAX_N=1e6+10;
const int MAX_P=MAX_N*4;
const int MAX=1e9;
ll val[MAX_N];
int tr[MAX_P];
ll ma[MAX_N];
ll n;
void maxi(){
  int m=-1,id;
  for(int i=0;i<n;i++){
    if(m<val[i]){
      m=val[i];
      id=i;
    }
    ma[i]=id;
  }
}
int unir(int a,int b){
  if(a==n || b==n){
    if(a==n) return b;
    if(b==n) return a;
    return n;
  }
  if(val[a]>val[b]) return a;
  else{
    if(val[a]==val[b]) return min(a,b);
    else return b;
  }
}
void init(int node,int a,int b){
  if(a==b){
    tr[node]=a;
    return;
  }
  int mid=(a+b)/2,le=2*node+1,ri=2*node+2;
  init(le,a,mid);
  init(ri,mid+1,b);
  tr[node]=unir(tr[le],tr[ri]);
}
ll query(int node,int a,int b,int l,int r){
  if(b<l || a>r) return n;
  if(l<=a && r>=b) return tr[node];
  int mid=(a+b)/2,le=2*node+1,ri=2*node+2;
  return unir(query(le,a,mid,l,r),query(ri,mid+1,b,l,r));
}
ll dp[MAX_N];
ll maxres(int l,int r){
  if(dp[r]!=-1) return dp[r];
  int i=ma[r];
  if(i==0) return val[i]*n;
  ll d=(n-i);
  ll ans=val[i]*n;
  for(int k=i-1;k>=0;k--){
    ans=min(ans,val[i]*d+maxres(0,k));
    d++;
  }
  return dp[r]=ans;
}
int main(){
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  cout.tie(NULL);
  memset(dp,-1,sizeof dp);
  cin>>n;
  for(int i=0;i<n;i++){
    int a; cin>>a;
    val[i]=a;
  }
  maxi();
  val[n]=-MAX;
  // init(0,0,n-1);
  cout<<maxres(0,n-1)<<endl;
}

Compilation message (stderr)

Discharging.cpp: In function 'void maxi()':
Discharging.cpp:18:11: warning: 'id' may be used uninitialized in this function [-Wmaybe-uninitialized]
   18 |     ma[i]=id;
      |           ^~

• Subtask 1: 9 / 9
• Subtask 2: 13 / 13
• Subtask 3: 0 / 25
• Subtask 4: 11 / 11
• Subtask 5: 14 / 14
• Subtask 6: 0 / 28