oj.uz

Submission #800444

# Submission time Handle Problem Language Result Execution time Memory
800444 2023-08-01T14:59:27 Z GrindMachine Feast (NOI19_feast) C++17
12 / 100
 1000 ms 10632 KB 
// Om Namah Shivaya

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

using namespace std;
using namespace __gnu_pbds;

template<typename T> using Tree = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
typedef long long int ll;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;

#define fastio ios_base::sync_with_stdio(false); cin.tie(NULL)
#define pb push_back
#define endl '\n'
#define sz(a) a.size()
#define setbits(x) __builtin_popcountll(x)
#define ff first
#define ss second
#define conts continue
#define ceil2(x, y) ((x + y - 1) / (y))
#define all(a) a.begin(), a.end()
#define rall(a) a.rbegin(), a.rend()
#define yes cout << "Yes" << endl
#define no cout << "No" << endl

#define rep(i, n) for(int i = 0; i < n; ++i)
#define rep1(i, n) for(int i = 1; i <= n; ++i)
#define rev(i, s, e) for(int i = s; i >= e; --i)
#define trav(i, a) for(auto &i : a)

template<typename T>
void amin(T &a, T b) {
    a = min(a, b);
}

template<typename T>
void amax(T &a, T b) {
    a = max(a, b);
}

#ifdef LOCAL
#include "debug.h"
#else
#define debug(x) 42
#endif

/*

refs:
edi

*/

const int MOD = 1e9 + 7;
const int N = 1e5 + 5;
const int inf1 = int(1e9) + 5;
const ll inf2 = ll(1e18) + 5;

void solve(int test_case)
{
    ll n,k; cin >> n >> k;
    vector<ll> a(n+5);
    rep1(i,n) cin >> a[i];

    vector<ll> b;
    b.pb(a[1]);
    
    for(int i = 2; i <= n; ++i){
        bool diff = false;
        if(a[i] < 0 and b.back() > 0) diff = true;
        if(a[i] > 0 and b.back() < 0) diff = true;
        if(diff){
            b.pb(a[i]);
        }
        else{
            b.back() += a[i];
        }
    } 

    if(b.front() <= 0){
        b.erase(b.begin());
    }
    if(sz(b) and b.back() <= 0){
        b.pop_back();
    }

    ll ans = 0;

    while(true){
        vector<ll> positives;
        rep(i,sz(b)){
            if(b[i] > 0){
                positives.pb(b[i]);
            }
        }

        sort(rall(positives));

        ll val = 0;
        rep(i,min((ll)sz(positives),k)){
            val += positives[i];
        }

        amax(ans,val);

        if(sz(positives) <= k) break;
        
        ll mn_abs = -inf2, pos = -1;
        rep(i,sz(b)){
            if(abs(b[i]) > mn_abs){
                mn_abs = abs(b[i]);
                pos = i;
            }
        }

        b.insert(b.begin(),0);
        b.pb(0);
        pos++;

        b[pos] += b[pos-1];
        b[pos] += b[pos+1];
        b[pos-1] = b[pos+1] = 0;

        vector<ll> c;
        c.pb(b[0]);

        rep1(i,(ll)sz(b)-1){
            bool diff = false;
            if(b[i] < 0 and c.back() > 0) diff = true;
            if(b[i] > 0 and c.back() < 0) diff = true;
            if(diff){
                c.pb(b[i]);
            }
            else{
                c.back() += b[i];
            }
        }

        if(c.front() <= 0){
            c.erase(c.begin());
        }
        if(sz(c) and c.back() <= 0){
            c.pop_back();
        }

        b = c;
    }

    cout << ans << endl;
}

int main()
{
    fastio;

    int t = 1;
    // cin >> t;

    rep1(i, t) {
        solve(i);
    }

    return 0;
}

Compilation message

feast.cpp: In function 'void solve(int)':
feast.cpp:30:36: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   30 | #define rep(i, n) for(int i = 0; i < n; ++i)
      |                                    ^
feast.cpp:95:9: note: in expansion of macro 'rep'
   95 |         rep(i,sz(b)){
      |         ^~~
feast.cpp:110:26: warning: comparison of integer expressions of different signedness: 'std::vector<long long int>::size_type' {aka 'long unsigned int'} and 'll' {aka 'long long int'} [-Wsign-compare]
  110 |         if(sz(positives) <= k) break;
      |                          ^
feast.cpp:30:36: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   30 | #define rep(i, n) for(int i = 0; i < n; ++i)
      |                                    ^
feast.cpp:113:9: note: in expansion of macro 'rep'
  113 |         rep(i,sz(b)){
      |         ^~~

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 24 ms 5272 KB Output is correct
2 Correct 25 ms 5448 KB Output is correct
3 Correct 25 ms 5468 KB Output is correct
4 Correct 26 ms 5444 KB Output is correct
5 Correct 25 ms 5448 KB Output is correct
6 Correct 24 ms 5276 KB Output is correct
7 Correct 24 ms 5324 KB Output is correct
8 Correct 31 ms 5452 KB Output is correct
9 Correct 25 ms 5392 KB Output is correct
10 Correct 27 ms 5432 KB Output is correct

Subtask #2
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 16 ms 3668 KB Output is correct
2 Correct 18 ms 3788 KB Output is correct
3 Correct 16 ms 3628 KB Output is correct
4 Correct 19 ms 3648 KB Output is correct
5 Correct 25 ms 5284 KB Output is correct
6 Correct 21 ms 3660 KB Output is correct
7 Correct 17 ms 3796 KB Output is correct
8 Correct 25 ms 5440 KB Output is correct
9 Correct 25 ms 5324 KB Output is correct
10 Correct 16 ms 3648 KB Output is correct

Subtask #3
0 / 18.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1077 ms 10632 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 212 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 11.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 212 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 20.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 212 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #7
0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 24 ms 5272 KB Output is correct
2 Correct 25 ms 5448 KB Output is correct
3 Correct 25 ms 5468 KB Output is correct
4 Correct 26 ms 5444 KB Output is correct
5 Correct 25 ms 5448 KB Output is correct
6 Correct 24 ms 5276 KB Output is correct
7 Correct 24 ms 5324 KB Output is correct
8 Correct 31 ms 5452 KB Output is correct
9 Correct 25 ms 5392 KB Output is correct
10 Correct 27 ms 5432 KB Output is correct
11 Correct 16 ms 3668 KB Output is correct
12 Correct 18 ms 3788 KB Output is correct
13 Correct 16 ms 3628 KB Output is correct
14 Correct 19 ms 3648 KB Output is correct
15 Correct 25 ms 5284 KB Output is correct
16 Correct 21 ms 3660 KB Output is correct
17 Correct 17 ms 3796 KB Output is correct
18 Correct 25 ms 5440 KB Output is correct
19 Correct 25 ms 5324 KB Output is correct
20 Correct 16 ms 3648 KB Output is correct
21 Execution timed out 1077 ms 10632 KB Time limit exceeded
22 Halted 0 ms 0 KB -