Submission #160321

#	Time	Username	Problem	Language	Result	Execution time	Memory
160321		12tqian	Semiexpress (JOI17_semiexpress)	C++14	100 / 100	36 ms	11384 KiB

semiexpress

#pragma comment(linker, "/stack:200000000")
//#pragma GCC optimize("Ofast")
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
#pragma GCC optimize ("O3")
#pragma GCC target ("sse4")
// #pragma GCC target ("avx2")
// #pragma GCC optimization ("unroll-loops")
#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;
template <class T> using Tree = tree<T, null_type, less<T>, rb_tree_tag,tree_order_statistics_node_update>;

const double PI = 4 * atan(1);

#define sz(x) (int)(x).size()
#define ll long long
#define ld long double
#define mp make_pair
#define pb push_back
#define eb emplace_back
#define pii pair <int, int>
#define vi vector<int>
#define f first
#define s second
#define lb lower_bound
#define ub upper_bound
#define all(x) x.begin(), x.end()
#define vpi vector<pair<int, int>>
#define vpd vector<pair<double, double>>
#define pd pair<double, double>

#define f0r(i,a) for(int i=0;i<a;i++)
#define f1r(i,a,b) for(int i=a;i<b;i++)
#define trav(a, x) for (auto& a : x)

template<typename A, typename B> ostream& operator<<(ostream &cout, pair<A, B> const &p) { return cout << "(" << p.f << ", " << p.s << ")"; }
template<typename A> ostream& operator<<(ostream &cout, vector<A> const &v) {
  cout << "["; for(int i = 0; i < v.size(); i++) {if (i) cout << ", "; cout << v[i];} return cout << "]";
}

void fast_io(){
    ios_base::sync_with_stdio(0);
    cin.tie(NULL);
    cout.tie(NULL);
}
void io(string taskname){
    string fin = taskname + ".in";
    string fout = taskname + ".out";
    const char* FIN = fin.c_str();
    const char* FOUT = fout.c_str();
    freopen(FIN, "r", stdin);
    freopen(FOUT, "w", stdout);
    fast_io();
}
const int MAX = 3005;
vector<double> s;
int n, m, k;
double a, b, c;
double t;
int best[MAX][MAX];
double zero = 0;
///int interval bewtwen s_id and s_{id+1} using use stations
int func(double l, double r, double last){
    double time = t - l*b;
    int sub = floor((time - (last - l)*c)/a) + last;
    if(sub >= r){
        return max(r -l - 1, zero);
    }
    else return max(sub -l, zero);
}
int get(int id, int use){
    double l = s[id];
    double r = s[id+1];
    double time = t - l*b;
    if(time<0) return 0;
    vector<double> loc;
    loc.eb(l);
    while(true){
        best[id][sz(loc) - 1] = func(l, r, loc[sz(loc) - 1]);
        if(sz(loc) == use + 1) break;
        double past = loc[sz(loc) - 1];
        double used = (past - l)*c;
        double nxt = past + floor((time - used)/a+1);
        loc.eb(nxt);
    }
    double last = loc[sz(loc) - 1];
    int sub = floor((time - (last - l)*c)/a) + last;
    if(sub >= r){
        return max(r -l - 1, zero);
    }
    else return max(sub -l, zero);
   // return max(min(r, floor((time - (last - l)/c)/a) + last) - l, zero);

}
int dp[MAX][MAX];
int v[MAX];
int main(){
    fast_io();
    cin >> n >> m >> k;
    k -= m;
    cin >> a >> b >> c;
    cin >> t;
    f0r(i, m){
        int si;
        cin >> si;
        si--;
        s.eb(si);
    }
    sort(all(s));
    f0r(i, m-1){
        get(i, k);
    }
    int ans = 0;
    f0r(i, m){
        if(s[i]*b <= t) ans++;
    }
    set<pii> s;
    f0r(i, m-1){
        ans += best[i][0];
        s.insert(mp(best[i][1] - best[i][0], i));
    }
    int use = 0;
    while(true){
        if(use == k) break;
        auto x = *s.rbegin();
        if(x.f == 0) break;
        use += 1;
        ans += x.f;
        int id = x.s;
        s.erase(*s.rbegin());
        v[id]++;
        s.insert(mp(best[id][v[id]+1] - best[id][v[id]], id));
    }
    cout << ans-1 << endl;
    return 0;
}

Compilation message (stderr)

semiexpress.cpp:1:0: warning: ignoring #pragma comment  [-Wunknown-pragmas]
 #pragma comment(linker, "/stack:200000000")
 
semiexpress.cpp: In function 'void io(std::__cxx11::string)':
semiexpress.cpp:54:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
     freopen(FIN, "r", stdin);
     ~~~~~~~^~~~~~~~~~~~~~~~~
semiexpress.cpp:55:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
     freopen(FOUT, "w", stdout);
     ~~~~~~~^~~~~~~~~~~~~~~~~~~

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