oj.uz

Submission #237728

# Submission time Handle Problem Language Result Execution time Memory
237728 2020-06-08T12:57:43 Z Half Feast (NOI19_feast) C++14
30 / 100
 220 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];

int 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 'int 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 181 ms 1400 KB Output is correct
2 Correct 182 ms 1528 KB Output is correct
3 Correct 187 ms 1528 KB Output is correct
4 Correct 182 ms 1528 KB Output is correct
5 Correct 196 ms 1528 KB Output is correct
6 Correct 182 ms 1488 KB Output is correct
7 Correct 179 ms 1528 KB Output is correct
8 Correct 180 ms 1528 KB Output is correct
9 Correct 175 ms 1400 KB Output is correct
10 Correct 181 ms 1656 KB Output is correct

Subtask #2
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 96 ms 1400 KB Output is correct
2 Correct 99 ms 1528 KB Output is correct
3 Correct 96 ms 1528 KB Output is correct
4 Correct 96 ms 1528 KB Output is correct
5 Correct 176 ms 1400 KB Output is correct
6 Correct 98 ms 1400 KB Output is correct
7 Correct 98 ms 1528 KB Output is correct
8 Correct 181 ms 1528 KB Output is correct
9 Correct 176 ms 1456 KB Output is correct
10 Correct 97 ms 1512 KB Output is correct

Subtask #3
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 193 ms 5732 KB Output is correct
2 Correct 198 ms 8676 KB Output is correct
3 Correct 200 ms 8804 KB Output is correct
4 Correct 195 ms 8824 KB Output is correct
5 Correct 207 ms 8676 KB Output is correct
6 Correct 198 ms 8952 KB Output is correct
7 Correct 199 ms 8804 KB Output is correct
8 Correct 198 ms 8676 KB Output is correct
9 Correct 201 ms 8940 KB Output is correct
10 Correct 220 ms 8808 KB Output is correct

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 384 KB Output is correct
2 Incorrect 65 ms 125560 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #5
0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 384 KB Output is correct
2 Incorrect 65 ms 125560 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #6
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 384 KB Output is correct
2 Incorrect 65 ms 125560 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #7
0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 181 ms 1400 KB Output is correct
2 Correct 182 ms 1528 KB Output is correct
3 Correct 187 ms 1528 KB Output is correct
4 Correct 182 ms 1528 KB Output is correct
5 Correct 196 ms 1528 KB Output is correct
6 Correct 182 ms 1488 KB Output is correct
7 Correct 179 ms 1528 KB Output is correct
8 Correct 180 ms 1528 KB Output is correct
9 Correct 175 ms 1400 KB Output is correct
10 Correct 181 ms 1656 KB Output is correct
11 Correct 96 ms 1400 KB Output is correct
12 Correct 99 ms 1528 KB Output is correct
13 Correct 96 ms 1528 KB Output is correct
14 Correct 96 ms 1528 KB Output is correct
15 Correct 176 ms 1400 KB Output is correct
16 Correct 98 ms 1400 KB Output is correct
17 Correct 98 ms 1528 KB Output is correct
18 Correct 181 ms 1528 KB Output is correct
19 Correct 176 ms 1456 KB Output is correct
20 Correct 97 ms 1512 KB Output is correct
21 Correct 193 ms 5732 KB Output is correct
22 Correct 198 ms 8676 KB Output is correct
23 Correct 200 ms 8804 KB Output is correct
24 Correct 195 ms 8824 KB Output is correct
25 Correct 207 ms 8676 KB Output is correct
26 Correct 198 ms 8952 KB Output is correct
27 Correct 199 ms 8804 KB Output is correct
28 Correct 198 ms 8676 KB Output is correct
29 Correct 201 ms 8940 KB Output is correct
30 Correct 220 ms 8808 KB Output is correct
31 Correct 5 ms 384 KB Output is correct
32 Incorrect 65 ms 125560 KB Output isn't correct
33 Halted 0 ms 0 KB -