oj.uz

Submission #237729

# Submission time Handle Problem Language Result Execution time Memory
237729 2020-06-08T12:58:48 Z Half Feast (NOI19_feast) C++14
30 / 100
 201 ms 125560 KB 
#include <iostream>
#include <vector>
#include <set>
#include <map>
#include <algorithm>
#include <cmath>

using namespace std;

typedef vector<int> vi;
typedef pair<int,int> pi;
typedef long long ll;

#define loop(i,a,b) for (int i = a; i <= b; i++)

#define INF ((unsigned) ~0)
#define F first
#define S second
#define PB push_back
#define MP make_pair

const int MXN = 500000;
int N, K;
int a[MXN];
vector<ll> g;
vector<ll> sg;
ll mem[4000][4000];

ll dp(int l, int n){
    if(l >= g.size())
        return 0;
    if(n <= 0)
        return 0;
    if(mem[l][n] != -1)
        return mem[l][n];
    ll sol = sg[l + 1] - sg[l];
    for(int i = l + 1; i <= g.size(); i++)
        for(int j = l; j <= i; j++)
            sol = max(sol, dp(i, n - 1) + sg[i] - sg[j]);
    mem[l][n] = sol;
    return sol;
}

int main(){
    cin >> N >> K;
    for(int i = 0; i < N; i++){
        cin >> a[i];
        if(g.size() == 0){
            g.push_back(a[i]);
        }else if((g[g.size() - 1] >= 0 && a[i] >= 0) || (g[g.size() - 1] < 0 && a[i] < 0)){
            g[g.size() - 1] += a[i];
        }else{
            //cout << g[g.size() - 1] << " ";
            g.push_back(a[i]);
        }
    }
    //cout << "\n";
    ll sm = 0;
    sg.push_back(0);
    for(int i = 0; i < g.size(); i++){
        sm += g[i];
        sg.push_back(sm);
    }
    if(g.size() == 1){
        cout << sm << "\n";
    }else if(g.size() == 2){
        cout << max(g[0], g[1]) << "\n";
    }else if(g.size() == 3 && g[0] > 0){
        if(K == 1)
            cout << max(max(g[0], g[2]), g[0] + g[1] + g[2]) << "\n";
        if(K >= 2)
            cout << g[0] + g[2] << "\n";
    }else if(K == 1){
        ll mx = 0;
        ll mxEnd = 0;
        for(int i = 0; i < g.size(); i++){
            mxEnd = max(mxEnd + g[i], g[i]);
            mx = max(mx, mxEnd);
        }
        cout << mx << "\n";
    }else{
        for(int i = 0; i < 4000; i++)
            for(int j = 0; j < 4000; j++)
                mem[i][j] = -1;
        cout << dp(0, N) << "\n";
    }
}

Compilation message

feast.cpp: In function 'll dp(int, int)':
feast.cpp:30:10: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     if(l >= g.size())
        ~~^~~~~~~~~~~
feast.cpp:37:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i = l + 1; i <= g.size(); i++)
                        ~~^~~~~~~~~~~
feast.cpp: In function 'int main()':
feast.cpp:60:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i = 0; i < g.size(); i++){
                    ~~^~~~~~~~~~
feast.cpp:76:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(int i = 0; i < g.size(); i++){
                        ~~^~~~~~~~~~

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 179 ms 1400 KB Output is correct
2 Correct 179 ms 1528 KB Output is correct
3 Correct 178 ms 1528 KB Output is correct
4 Correct 176 ms 1528 KB Output is correct
5 Correct 175 ms 1528 KB Output is correct
6 Correct 179 ms 1532 KB Output is correct
7 Correct 175 ms 1456 KB Output is correct
8 Correct 177 ms 1528 KB Output is correct
9 Correct 174 ms 1624 KB Output is correct
10 Correct 179 ms 1528 KB Output is correct

Subtask #2
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 93 ms 1528 KB Output is correct
2 Correct 100 ms 1528 KB Output is correct
3 Correct 92 ms 1400 KB Output is correct
4 Correct 96 ms 1528 KB Output is correct
5 Correct 175 ms 1528 KB Output is correct
6 Correct 95 ms 1400 KB Output is correct
7 Correct 98 ms 1528 KB Output is correct
8 Correct 184 ms 1528 KB Output is correct
9 Correct 177 ms 1528 KB Output is correct
10 Correct 97 ms 1528 KB Output is correct

Subtask #3
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 200 ms 5716 KB Output is correct
2 Correct 191 ms 5736 KB Output is correct
3 Correct 195 ms 5732 KB Output is correct
4 Correct 195 ms 5732 KB Output is correct
5 Correct 200 ms 5776 KB Output is correct
6 Correct 200 ms 5888 KB Output is correct
7 Correct 201 ms 5860 KB Output is correct
8 Correct 199 ms 5872 KB Output is correct
9 Correct 199 ms 5732 KB Output is correct
10 Correct 201 ms 5732 KB Output is correct

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 384 KB Output is correct
2 Correct 65 ms 125560 KB Output is correct
3 Incorrect 78 ms 125560 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #5
0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 384 KB Output is correct
2 Correct 65 ms 125560 KB Output is correct
3 Incorrect 78 ms 125560 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #6
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 384 KB Output is correct
2 Correct 65 ms 125560 KB Output is correct
3 Incorrect 78 ms 125560 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #7
0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 179 ms 1400 KB Output is correct
2 Correct 179 ms 1528 KB Output is correct
3 Correct 178 ms 1528 KB Output is correct
4 Correct 176 ms 1528 KB Output is correct
5 Correct 175 ms 1528 KB Output is correct
6 Correct 179 ms 1532 KB Output is correct
7 Correct 175 ms 1456 KB Output is correct
8 Correct 177 ms 1528 KB Output is correct
9 Correct 174 ms 1624 KB Output is correct
10 Correct 179 ms 1528 KB Output is correct
11 Correct 93 ms 1528 KB Output is correct
12 Correct 100 ms 1528 KB Output is correct
13 Correct 92 ms 1400 KB Output is correct
14 Correct 96 ms 1528 KB Output is correct
15 Correct 175 ms 1528 KB Output is correct
16 Correct 95 ms 1400 KB Output is correct
17 Correct 98 ms 1528 KB Output is correct
18 Correct 184 ms 1528 KB Output is correct
19 Correct 177 ms 1528 KB Output is correct
20 Correct 97 ms 1528 KB Output is correct
21 Correct 200 ms 5716 KB Output is correct
22 Correct 191 ms 5736 KB Output is correct
23 Correct 195 ms 5732 KB Output is correct
24 Correct 195 ms 5732 KB Output is correct
25 Correct 200 ms 5776 KB Output is correct
26 Correct 200 ms 5888 KB Output is correct
27 Correct 201 ms 5860 KB Output is correct
28 Correct 199 ms 5872 KB Output is correct
29 Correct 199 ms 5732 KB Output is correct
30 Correct 201 ms 5732 KB Output is correct
31 Correct 4 ms 384 KB Output is correct
32 Correct 65 ms 125560 KB Output is correct
33 Incorrect 78 ms 125560 KB Output isn't correct
34 Halted 0 ms 0 KB -