Submission #1265085

#	Time	Username	Problem	Language	Result	Execution time	Memory
1265085		lmaobruh	Semiexpress (JOI17_semiexpress)	C++20	100 / 100	30 ms	16908 KiB

semiexpress

#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define eb emplace_back
#define pb push_back
#define fi first
#define se second
#define ii pair<int,int>
#define ve vector
#define all(x) x.begin(), x.end()
#define fo(i,a,b) for (int i=(a),_b=(b); i<=_b; ++i)
#define fd(i,a,b) for (int i=(a),_b=(b); i>=_b; --i)
#define maxi(a, b) a = max(a, b)
#define mini(a, b) a = min(a, b)

const int N = 1e6+5, inf = 1e9+10, mod = 1e9+7;

/*
    n <= 300 :
        f[i][j][k] : so luong max neu den i co j chuyen, va chuyen gan nhat la k
    E < S < L
    
    K <= 3000 :
        greedy
*/

bool st_mem;

int n, m, k;
ll L, E, S, T, s[30005];

void fool() {
    k -= m;
    ve<ll> add;
    ll ans=(1ll*(n-1)*E<=T);
    fo(i,1,m-1) {
        ll tmin=(s[i]-1)*E, len=s[i+1]-s[i]-1;
        if (tmin > T) break;
        ans += (i > 1);
        ll tt = T - tmin, wl = tt / L, lst = wl;
        ve<ll> cur; cur.eb(lst);
        fo(j,1,k) {
            ll sem = (wl + 1) * S;
            if (sem > tt) break;
            lst++; tt -= sem;
            wl = tt / L; lst+=wl;
            cur.eb(lst);
        }
        for (ll &x:cur) mini(x, len);
        ans += cur[0];
        fo(j,1,(int)cur.size()-1) add.eb(cur[j]-cur[j-1]);
    }
    sort(all(add),greater<ll>());
    int i=0;
    while (k--) {
        if (i>=(int)add.size()) break;
        ans+=add[i++];
    }
    cout << ans;
}

void sol() {
    cin >> n >> m >> k >> L >> E >> S >> T;
    fo(i,1,m) cin >> s[i];
    fool();
}

bool en_mem;

signed main(){
    ios::sync_with_stdio(0); cin.tie(0);
    if(fopen("A.inp","r")) {
        freopen("A.inp","r",stdin);
        freopen("A.out","w",stdout);
    }
    int tc = 1; // cin >> tc;
    fo(i,1,tc) sol();
    cerr << abs(&st_mem - &en_mem) / 1024.0 / 1024.0;
    return 0;
}

Compilation message (stderr)

semiexpress.cpp: In function 'int main()':
semiexpress.cpp:73:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   73 |         freopen("A.inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~
semiexpress.cpp:74:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   74 |         freopen("A.out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~

• Subtask 1: 18 / 18
• Subtask 2: 30 / 30
• Subtask 3: 52 / 52