제출 #46812

#제출 시각아이디문제언어결과실행 시간메모리
46812golubSemiexpress (JOI17_semiexpress)C++14
48 / 100
6 ms2384 KiB
//#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> #define len(x) (long long)x.size() 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; set<pii, greater<pii>> active; int A, B, C, T; int n, m, k; void try_add(int base_time, int l, int r) { if (l >= r || base_time > T || len(active) > 5 * k) return; int cnt = (T - base_time) / A; if (l + cnt >= r) { cnt = r - l - 1; } active.insert({cnt, l}); base_time += (cnt + 1) * C; try_add(base_time, l + cnt + 1, r); } int solve(vector<int> s) { assert(len(s) <= k && len(s) >= m); int ans = 0; s.pb(n + 1); int cur_time = 0; int last_express_station = 0; for (int i = 0; i < len(s) - 1; i++) { if (semiexpress.count(s[i])) { cur_time = (last_express_station - 1) * B + (s[i] - last_express_station) * C; } else { last_express_station = s[i]; cur_time = (last_express_station - 1) * B; } if (cur_time > T) continue; int cnt = (T - cur_time) / A; assert(cnt >= 0); if (s[i] + cnt >= s[i + 1]) { cnt = s[i + 1] - s[i] - 1; } assert(cnt >= 0); ans += cnt + 1; } return ans - 1; } 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; vector<int> s(m); for (auto &in: s) cin >> in; for (int i = 0; i < m; i++) { int base_time = (s[i] - 1) * B; if (i < m - 1) try_add(base_time, s[i], s[i + 1]); else try_add(base_time, s[i], n + 1); if (len(active) > 5 * k) break; } set<int> cur_station; for (auto x: s) cur_station.insert(x); for (auto x: active) { if (!cur_station.count(x.S)) { semiexpress.insert(x.S); } cur_station.insert(x.S); if (len(cur_station) == k) break; } int ans = solve(vector<int>(all(cur_station))); assert(ans >= 0); cout << ans << '\n'; }
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