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Submission #242671

# Submission time Handle Problem Language Result Execution time Memory
242671 2020-06-28T22:58:39 Z AmineWeslati Feast (NOI19_feast) C++14
30 / 100
 1000 ms 8696 KB 
//Never stop trying
#pragma GCC optimize("O3")
#include <bits/stdc++.h>
#include<ext/pb_ds/assoc_container.hpp>
#include<ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
using namespace std;

template <typename T>
using ordered_set=tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
//s.order_of_key(), *s.find_by_order()

using namespace std;
#define boost ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0)

typedef string str;
typedef long long ll;
#define int ll
typedef double db;
typedef long double ld;

typedef pair<int,int> pi;
#define fi first
#define se second

typedef vector<int> vi;
typedef vector<ld> vd;
typedef vector<str> vs;
typedef vector<pi> vpi;

#define pb push_back
#define eb emplace_back
#define pf push_front

#define lb lower_bound
#define ub upper_bound

#define sz(x) (int)x.size()
#define all(x) begin(x), end(x)
#define rall(x) rbegin(x), rend(x)
#define endl "\n"

const int MOD = 1e9+7; //998244353
const ll INF = 1e18;
const int nx[4]={0,0,1,-1}, ny[4]={1,-1,0,0}; //right left down up

int t[300001];
int pref[300001];
int memo[300][301];
int N,K;

int solve(int i, int r){
   if(!r) return 0;
   if(i==N) return -INF;
   int ans=0;
   for(int j=i; j<N; j++){
      for(int k=j+1; k<N; k++){
         ans=max(ans,solve(k,r-1)+pref[j]-pref[i-1]);
      }
   }
   return memo[i][r]=ans;
}

int32_t main(){
   boost;
   memset(memo,-1,sizeof(memo));
   cin>>N>>K;
   pref[0]=0;
   int cnt=0;
   for(int i=0; i<N; i++){
      cin>>t[i];
      pref[i+1]=t[i];
      if(i) pref[i+1]+=pref[i];
      if(t[i]<0) cnt++;
   }
   
   if(cnt==0 ||(cnt==1 && K>1)){
      int res=0;
      for(int i=0; i<N; i++) if(t[i]>0) res+=t[i];
      cout << res << endl;
   }
   else if(cnt==1){
      int s=0,ss=0,sss=0;
      int idx=0;
      while(t[idx]>=0){s+=t[idx]; idx++;}
      sss+=t[idx]; idx++;
      while(idx<N && t[idx]>=0){ss+=t[idx]; idx++;}
      cout << max(max(s,ss),s+ss+sss) << endl;
   }
   else if(K==1){
      int s=0;
      int res=0;
      for(int i=0; i<N; i++){
         s+=t[i];
         res=max(res,s);
         if(s<=0) s=0;
      }
      cout << res << endl;
   }
   else if(N<=300){
      int res=0;
      for(int i=0; i<N; i++) res=max(res,solve(i,K));
      cout << res << endl;
   }


   return 0;
}

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 45 ms 5624 KB Output is correct
2 Correct 43 ms 5624 KB Output is correct
3 Correct 46 ms 5752 KB Output is correct
4 Correct 44 ms 5724 KB Output is correct
5 Correct 49 ms 5628 KB Output is correct
6 Correct 53 ms 5624 KB Output is correct
7 Correct 49 ms 5624 KB Output is correct
8 Correct 46 ms 5624 KB Output is correct
9 Correct 45 ms 5624 KB Output is correct
10 Correct 48 ms 5624 KB Output is correct

Subtask #2
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 26 ms 5632 KB Output is correct
2 Correct 32 ms 6912 KB Output is correct
3 Correct 26 ms 6808 KB Output is correct
4 Correct 27 ms 6808 KB Output is correct
5 Correct 46 ms 8440 KB Output is correct
6 Correct 27 ms 6784 KB Output is correct
7 Correct 31 ms 6904 KB Output is correct
8 Correct 49 ms 8696 KB Output is correct
9 Correct 43 ms 8312 KB Output is correct
10 Correct 29 ms 6784 KB Output is correct

Subtask #3
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 55 ms 5624 KB Output is correct
2 Correct 51 ms 5624 KB Output is correct
3 Correct 61 ms 5624 KB Output is correct
4 Correct 52 ms 5624 KB Output is correct
5 Correct 61 ms 5728 KB Output is correct
6 Correct 54 ms 5752 KB Output is correct
7 Correct 52 ms 5752 KB Output is correct
8 Correct 51 ms 5624 KB Output is correct
9 Correct 59 ms 5752 KB Output is correct
10 Correct 53 ms 5752 KB Output is correct

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 1024 KB Output is correct
2 Execution timed out 1087 ms 1024 KB Time limit exceeded
3 Halted 0 ms 0 KB -

Subtask #5
0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 1024 KB Output is correct
2 Execution timed out 1087 ms 1024 KB Time limit exceeded
3 Halted 0 ms 0 KB -

Subtask #6
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 1024 KB Output is correct
2 Execution timed out 1087 ms 1024 KB Time limit exceeded
3 Halted 0 ms 0 KB -

Subtask #7
0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 45 ms 5624 KB Output is correct
2 Correct 43 ms 5624 KB Output is correct
3 Correct 46 ms 5752 KB Output is correct
4 Correct 44 ms 5724 KB Output is correct
5 Correct 49 ms 5628 KB Output is correct
6 Correct 53 ms 5624 KB Output is correct
7 Correct 49 ms 5624 KB Output is correct
8 Correct 46 ms 5624 KB Output is correct
9 Correct 45 ms 5624 KB Output is correct
10 Correct 48 ms 5624 KB Output is correct
11 Correct 26 ms 5632 KB Output is correct
12 Correct 32 ms 6912 KB Output is correct
13 Correct 26 ms 6808 KB Output is correct
14 Correct 27 ms 6808 KB Output is correct
15 Correct 46 ms 8440 KB Output is correct
16 Correct 27 ms 6784 KB Output is correct
17 Correct 31 ms 6904 KB Output is correct
18 Correct 49 ms 8696 KB Output is correct
19 Correct 43 ms 8312 KB Output is correct
20 Correct 29 ms 6784 KB Output is correct
21 Correct 55 ms 5624 KB Output is correct
22 Correct 51 ms 5624 KB Output is correct
23 Correct 61 ms 5624 KB Output is correct
24 Correct 52 ms 5624 KB Output is correct
25 Correct 61 ms 5728 KB Output is correct
26 Correct 54 ms 5752 KB Output is correct
27 Correct 52 ms 5752 KB Output is correct
28 Correct 51 ms 5624 KB Output is correct
29 Correct 59 ms 5752 KB Output is correct
30 Correct 53 ms 5752 KB Output is correct
31 Correct 5 ms 1024 KB Output is correct
32 Execution timed out 1087 ms 1024 KB Time limit exceeded
33 Halted 0 ms 0 KB -