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Submission #1017636

# Submission time Handle Problem Language Result Execution time Memory
1017636 2024-07-09T09:16:22 Z vjudge1 Feast (NOI19_feast) C++17
4 / 100
 68 ms 12124 KB 
#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define endl '\n'
#define ll long long
#define int long long
const long long inf=1e18;
const int MOD=998244353;
const int N=3e5+5;
int n,k,a[N];
pair<int,int> dp[N][2];
int func(int lambda){
    dp[0][0]={0,0};//empty
    dp[0][1]={-lambda,0};//using it
    for(int i=1;i<=n;i++){
        dp[i][0]=max(dp[i-1][0],dp[i-1][1]);
        int x=dp[i-1][0].first-lambda+a[i],y=dp[i-1][1].first+a[i];
        if(x>y || (x==y && dp[i-1][0]<dp[i-1][1])){
            dp[i][1].first=x;
            dp[i][1].second=dp[i-1][0].second+1;
        }
        else{
            dp[i][1].first=y;
            dp[i][1].second=dp[i-1][1].second;
        }
    }
    int x=dp[n][0].first,y=dp[n][1].first;
    if(x==y && dp[n][1]<dp[n][0])swap(dp[n][0],dp[n][1]);
    return (x>y?dp[n][0].second:dp[n][1].second);
}
signed main() {
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    cin>>n>>k;
    for(int i=1;i<=n;i++)cin>>a[i];
    int l=0,r=1e18;
    while(l<r){
        int mid=(l+r+1)/2;
        int x=func(mid);
        if(x>=k)l=mid;
        else r=mid-1;
    }
    func(l);
    cout<<max(dp[n][0].first+l*dp[n][0].second,dp[n][1].first+l*dp[n][1].second);
}

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 52 ms 12100 KB Output is correct
2 Correct 49 ms 12124 KB Output is correct
3 Correct 49 ms 12124 KB Output is correct
4 Correct 56 ms 12112 KB Output is correct
5 Correct 49 ms 12120 KB Output is correct
6 Correct 49 ms 12120 KB Output is correct
7 Correct 48 ms 12124 KB Output is correct
8 Correct 49 ms 12124 KB Output is correct
9 Correct 51 ms 11856 KB Output is correct
10 Correct 48 ms 12120 KB Output is correct

Subtask #2
0 / 8.0

# Verdict Execution time Memory Grader output
1 Incorrect 43 ms 12024 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 18.0

# Verdict Execution time Memory Grader output
1 Incorrect 68 ms 11984 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 2396 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 11.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 2396 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 20.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 2396 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #7
0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 52 ms 12100 KB Output is correct
2 Correct 49 ms 12124 KB Output is correct
3 Correct 49 ms 12124 KB Output is correct
4 Correct 56 ms 12112 KB Output is correct
5 Correct 49 ms 12120 KB Output is correct
6 Correct 49 ms 12120 KB Output is correct
7 Correct 48 ms 12124 KB Output is correct
8 Correct 49 ms 12124 KB Output is correct
9 Correct 51 ms 11856 KB Output is correct
10 Correct 48 ms 12120 KB Output is correct
11 Incorrect 43 ms 12024 KB Output isn't correct
12 Halted 0 ms 0 KB -