Submission #46796

#	Time	Username	Problem	Language	Result	Execution time	Memory
46796		golub	Semiexpress (JOI17_semiexpress)	C++14	0 / 100	2 ms	376 KiB

semiexpress

//#pragma GCC optimize("Ofast")
//#pragma GCC target("sse,sse2,sse3,sse4")
//#pragma GCC optimize("unroll-loops")
//#pragma GCC optimize("unroll-all-loops")

#include <bits/stdc++.h>

//#define TASK "lca"

#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define F first
#define S second
#define pb push_back
#define int long long
#define pii pair<int, int>

typedef long long ll;
//typedef long double ld;

using namespace std;

const int INF = 1e18;
const int MAXN = 1e8;
const int MOD = 1e9 + 7;
const double EPS = 1e-12;

const vector<int> dx = {1, 0, -1, 0, 0, 1, 0, -1};

//char buf[(int)1e9];
//size_t p_ = 0;
//
//inline void *operator new(size_t n_) {
//    p_ += n_;
//    return buf + p_ - n_;
//}
//inline void operator delete(void*) {};

ll power(ll x, ll n, ll mod = 1e9 + 7) {
    if (n == 0) return 1ll;
    if (n & 1ll) return power(x, n - 1ll, mod) * x % mod;
    ll tmp = power(x, n >> 1ll, mod);
    return (tmp * tmp) % mod;
}

ll gcd(ll a, ll b) {
    if (b == 0) return a;
    return gcd (b, a % b);
}

ll lcm(ll a, ll b) {
    return a / gcd(a, b) * b;
}

set<int> semiexpress;

int A, B, C, T;
int n, m, k;

int calc(vector<int> s) {
    int ans = 0;
    int last = 0;
    int base_time = 0;
    for (int i = 0; i < s.size(); i++) {
        if (i != 0 && semiexpress.count(s[i])) {
            base_time = (last - 1) * B +  (s[i] - last) * C;
        } else {
            last = s[i];
            base_time = (s[i] - 1) * B;
        }
        if (base_time < T) ans++;
        int cnt = max(0ll, ((T - base_time - 1) / A));
        if (s[i] + cnt > n || (s[i] + cnt >= s[i + 1] && i + 1 < s.size())) {
            if (s[i] + cnt > n) cnt = n - s[i];
            if (i + 1 < s.size() && s[i] + cnt >= s[i + 1]) {
                cnt = s[i + 1] - s[i] - 1;
            }
        }
        ans += cnt;
    }
    return ans;
}

signed main() {
#ifndef LOCAL
#ifdef TASK
    freopen(TASK".in", "r", stdin);
    freopen(TASK".out", "w", stdout);
#endif
#endif
#ifdef LOCAL
    //freopen("/Users/alekseygolub/Desktop/с++/ABS/ABS/input.txt", "r", stdin);
#endif
    iostream::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    srand(924653523);
    // == SOLUTION == //
    cin >> n >> m >> k;
    cin >> A >> B >> C >> T;
    T++;
    vector<int> s(m);
    for (auto &in: s) cin >> in;
    set<pii, greater<pii>> active;
    
    for (int i = 0; i < m - 1; i++) {
        //if (active.size() >= 2 * k) break;
        int base_time = (s[i] - 1) * B;
        int r = s[i] + ((T - base_time - 1) / A);
        int add = r + 1;
        while (r + 1 < s[i + 1] && base_time < T && active.size() < 2 * (k - m)) {
            base_time = base_time + (add - s[i]) * C;
            //if (base_time >= T) break;
            int cnt = max(0ll, ((T - base_time - 1) / A));
            assert(add != s[i] && add != s[i + 1]);
            active.insert({cnt, add});
            r = add + cnt;
            add = r + 1;
        }
    }
    k -= m;
    for (auto in: active) {
        if (k <= 0) break;
        s.pb(in.S);
        semiexpress.insert(in.S);
        k--;
    }
    sort(all(s));
    cout << calc(s) - 1 << "\n";
    cerr << "OK\n";
}

Compilation message (stderr)

semiexpress.cpp: In function 'long long int calc(std::vector<long long int>)':
semiexpress.cpp:64:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 0; i < s.size(); i++) {
                     ~~^~~~~~~~~~
semiexpress.cpp:73:64: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         if (s[i] + cnt > n || (s[i] + cnt >= s[i + 1] && i + 1 < s.size())) {
                                                          ~~~~~~^~~~~~~~~~
semiexpress.cpp:75:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             if (i + 1 < s.size() && s[i] + cnt >= s[i + 1]) {
                 ~~~~~~^~~~~~~~~~
semiexpress.cpp: In function 'int main()':
semiexpress.cpp:111:67: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         while (r + 1 < s[i + 1] && base_time < T && active.size() < 2 * (k - m)) {
                                                     ~~~~~~~~~~~~~~^~~~~~~~~~~~~

• Subtask 1: 0 / 18
• Subtask 2: 0 / 30
• Subtask 3: 0 / 52