Submission #704636

#	Time	Username	Problem	Language	Result	Execution time	Memory
704636		Alihan_8	선물상자 (IOI15_boxes)	C++17	100 / 100	635 ms	333064 KiB

boxes

#include <bits/stdc++.h>
// include <ext/pb_ds/assoc_container.hpp>
// include <ext/pb_ds/tree_policy.hpp>
// using namespace __gnu_pbds;
using namespace std;
#define all(x) x.begin(), x.end()
#define pb push_back
// define ordered_set tree<int,null_type,less<int>,rb_tree_tag,tree_order_statistics_node_update>
#define mpr make_pair
#define ln '\n'
void IO(string name){freopen((name+".in").c_str(),"r",stdin); freopen((name+".out").c_str(),"w",stdout);}
//#define int long long
long long delivery(int n, int k, int L, int P[]){
    vector <int> p;
    for ( int i = 0; i < n; i++ ){
        if ( !P[i] ) continue;
        p.pb(P[i]);
    }
    n = (int)p.size();
    vector <long long> pref(n+1), suff(n+2);
    for ( int i = 1; i <= n; i++ ){
        pref[i] = pref[max(0, i-k)]+p[i-1]*2;
    }
    for ( auto &i: p ) i = L-i;
    for ( int i = n; i > 0; i-- ){
        suff[i] = suff[min(n+1, i+k)]+p[i-1]*2;
    }
    long long Mn = 1e18;
    for ( int i = 0; i <= n; i++ ){
        Mn = min(Mn, pref[i]+suff[i+1]);
        Mn = min(Mn, pref[i]+L+suff[min(n+1, i+k+1)]);
    }
    return Mn;
}
#if false
signed main(){
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    int n, k, L; cin >> n >> k >> L;
    int p[n];
    for ( int i = 0; i < n; i++ ) cin >> p[i];
    cout << delivery(n, k, L, p);

    cout << '\n';
/*
3 2 8
1 2 5
answer : 10
*/
}
#endif

Compilation message (stderr)

boxes.cpp: In function 'void IO(std::string)':
boxes.cpp:11:29: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   11 | void IO(string name){freopen((name+".in").c_str(),"r",stdin); freopen((name+".out").c_str(),"w",stdout);}
      |                      ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
boxes.cpp:11:70: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   11 | void IO(string name){freopen((name+".in").c_str(),"r",stdin); freopen((name+".out").c_str(),"w",stdout);}
      |                                                               ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 15 / 15
• Subtask 4: 15 / 15
• Subtask 5: 20 / 20
• Subtask 6: 30 / 30