oj.uz

Submission #1016536

# Submission time Handle Problem Language Result Execution time Memory
1016536 2024-07-08T07:50:44 Z GrindMachine Homecoming (BOI18_homecoming) C++17
31 / 100
 1000 ms 125912 KB 
#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) (int)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(...) 42
#endif

/*



*/

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

#include "homecoming.h"

template<typename T>
struct segtree {
    // https://codeforces.com/blog/entry/18051

    /*=======================================================*/

    struct data {
        ll a;
    };

    data neutral = {-inf2};

    data merge(data &left, data &right) {
        data curr;
        curr.a = max(left.a,right.a);
        return curr;
    }

    void create(int i, T v) {
        tr[i].a = v;
    }

    void modify(int i, T v) {
        tr[i].a = v;
    }

    /*=======================================================*/

    int n;
    vector<data> tr;

    segtree() {

    }

    segtree(int siz) {
        init(siz);
    }

    void init(int siz) {
        n = siz;
        tr.assign(2 * n, neutral);
    }

    void build(vector<T> &a, int siz) {
        rep(i, siz) create(i + n, a[i]);
        rev(i, n - 1, 1) tr[i] = merge(tr[i << 1], tr[i << 1 | 1]);
    }

    void pupd(int i, T v) {
        modify(i + n, v);
        for (i = (i + n) >> 1; i; i >>= 1) tr[i] = merge(tr[i << 1], tr[i << 1 | 1]);
    }

    data query(int l, int r) {
        data resl = neutral, resr = neutral;

        for (l += n, r += n; l <= r; l >>= 1, r >>= 1) {
            if (l & 1) resl = merge(resl, tr[l++]);
            if (!(r & 1)) resr = merge(tr[r--], resr);
        }

        return merge(resl, resr);
    }
};

ll solve(int n, int k, int *A, int *B){
    vector<ll> a(n), b(n);
    rep(i,n) a[i] = A[i], b[i] = B[i];
    ll initial = 0;
    rep(i,n) initial += a[i]-b[i];
    ll ans = 0;

    rep(cyc_shift,k+5){
        if(cyc_shift){
            rotate(a.begin(),a.begin()+1,a.end());
            rotate(b.begin(),b.begin()+1,b.end());
        }

        vector<ll> p(n);
        rep(i,n){
            p[i] = a[i]+(i?p[i-1]:0);
        }

        vector<ll> dp(n,-inf2);
        vector<ll> pmx(n,-inf2);
        segtree<ll> st(n);

        for(int i = k; i < n; ++i){
            dp[i] = b[i]-(p[i]-p[i-k]);
            ll val1 = st.query(0,i-1).a+b[i]-p[i];
            ll val2 = pmx[i-k]+b[i]-(p[i]-p[i-k]);
            dp[i] = max({dp[i],val1,val2});
            st.pupd(i,dp[i]+p[i]);
            pmx[i] = max(pmx[i-1],dp[i]);
        }

        amax(ans,*max_element(all(dp)));

        // trav(x,a) cout << x << " ";
        // cout << endl;
        
        // trav(x,b) cout << x << " ";
        // cout << endl;
    }

    ans += initial;
    amax(ans,0ll);
    return ans;
}

Subtask #1
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 356 KB Output is correct
2 Correct 2 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 2 ms 348 KB Output is correct
5 Correct 1 ms 344 KB Output is correct

Subtask #2
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 356 KB Output is correct
2 Correct 2 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 2 ms 348 KB Output is correct
5 Correct 1 ms 344 KB Output is correct
6 Correct 202 ms 768 KB Output is correct
7 Correct 413 ms 768 KB Output is correct
8 Correct 52 ms 344 KB Output is correct
9 Correct 38 ms 768 KB Output is correct
10 Correct 2 ms 348 KB Output is correct

Subtask #3
0 / 31.0

# Verdict Execution time Memory Grader output
1 Correct 479 ms 31880 KB Output is correct
2 Correct 60 ms 348 KB Output is correct
3 Execution timed out 1071 ms 125912 KB Time limit exceeded
4 Halted 0 ms 0 KB -

Subtask #4
0 / 38.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 356 KB Output is correct
2 Correct 2 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 2 ms 348 KB Output is correct
5 Correct 1 ms 344 KB Output is correct
6 Correct 202 ms 768 KB Output is correct
7 Correct 413 ms 768 KB Output is correct
8 Correct 52 ms 344 KB Output is correct
9 Correct 38 ms 768 KB Output is correct
10 Correct 2 ms 348 KB Output is correct
11 Correct 479 ms 31880 KB Output is correct
12 Correct 60 ms 348 KB Output is correct
13 Execution timed out 1071 ms 125912 KB Time limit exceeded
14 Halted 0 ms 0 KB -