oj.uz

Submission #61839

# Submission time Handle Problem Language Result Execution time Memory
61839 2018-07-26T20:33:32 Z Benq Homecoming (BOI18_homecoming) C++11
0 / 100
 311 ms 125792 KB 
#include <bits/stdc++.h>
#include <ext/pb_ds/tree_policy.hpp>
#include <ext/pb_ds/assoc_container.hpp>

using namespace std;
using namespace __gnu_pbds;
 
typedef long long ll;
typedef long double ld;
typedef complex<ld> cd;

typedef pair<int, int> pi;
typedef pair<ll,ll> pl;
typedef pair<ld,ld> pd;

typedef vector<int> vi;
typedef vector<ld> vd;
typedef vector<ll> vl;
typedef vector<pi> vpi;
typedef vector<pl> vpl;
typedef vector<cd> vcd;

template <class T> using Tree = tree<T, null_type, less<T>, rb_tree_tag,tree_order_statistics_node_update>;

#define FOR(i, a, b) for (int i=a; i<(b); i++)
#define F0R(i, a) for (int i=0; i<(a); i++)
#define FORd(i,a,b) for (int i = (b)-1; i >= a; i--)
#define F0Rd(i,a) for (int i = (a)-1; i >= 0; i--)

#define sz(x) (int)(x).size()
#define mp make_pair
#define pb push_back
#define f first
#define s second
#define lb lower_bound
#define ub upper_bound
#define all(x) x.begin(), x.end()

const int MOD = 1000000007;
const ll INF = 1e18;
const int MX = 2000001;

#include "homecoming.h"

ll ca[MX], cb[2*MX], dp[MX][2][2];

ll get(int l, int r) { return cb[r+1]-cb[l]; }

long long int solve(int N, int K, int *A, int *B) {
    F0R(i,N) ca[i+1] = ca[i]+A[i];
    F0R(i,2*N) cb[i+1] = cb[i]+B[i%N];
    
    ll ans = max(0LL,ca[N]-cb[N]);
    F0R(i,N) F0R(j,2) F0R(k,2) dp[i][j][k] = -INF;
    dp[0][0][0] = 0, dp[0][1][1] = A[0]-get(0,K-1);
    FOR(i,1,N) {
        F0R(j,2) {
            dp[i][0][j] = max(dp[i-1][0][j],dp[i-1][1][j]);
            if (j == 0 || i+K-1 < N) {
                dp[i][1][j] = max(dp[i-1][1][j]+A[i]-B[i+K-1],dp[i-1][0][j]+A[i]-get(i,i+K-1));
            } else {
                dp[i][1][j] = max(dp[i-1][1][j]+A[i],dp[i-1][0][j]+A[i]-get(i,N-1));
            }
        } 
    }
    F0R(j,2) F0R(k,2) ans = max(ans,dp[N-1][j][k]);
    return ans;
}

/*int main() {
    ios_base::sync_with_stdio(0); cin.tie(0);
    int A[3] = {40, 80, 100};
    int B[3] = {140, 0, 20};
    cout << solve(3, 2,A,B);
}*/

/* Look for:
* the exact constraints (multiple sets are too slow for n=10^6 :( ) 
* special cases (n=1?)
* overflow (ll vs int?)
* array bounds
*/

Subtask #1
0 / 13.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 380 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 18.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 380 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 31.0

# Verdict Execution time Memory Grader output
1 Correct 65 ms 31648 KB Output is correct
2 Correct 5 ms 31648 KB Output is correct
3 Correct 311 ms 125792 KB Output is correct
4 Incorrect 5 ms 125792 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #4
0 / 38.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 380 KB Output isn't correct
2 Halted 0 ms 0 KB -