Submission #854658

#	Time	Username	Problem	Language	Result	Execution time	Memory
854658		BrineTw	Semiexpress (JOI17_semiexpress)	C++14	18 / 100	0 ms	348 KiB

semiexpress

#pragma GCC optimize("O3")
#include <bits/stdc++.h>

#define debug(x) cerr << #x << ' ' << x << '\n'
#define endl '\n'

using namespace std;

const int M = 1e9 + 7;
typedef long long ll;
typedef pair<ll, ll> pii;
typedef pair<ll, pii> piii;

int main() {
    ios_base::sync_with_stdio(0), cin.tie(0), cout.tie(0);

    int N, M, K;
    cin >> N >> M >> K;

    K -= M;

    ll vA, vB, vC;
    cin >> vA >> vB >> vC;

    ll limit;
    cin >> limit;

    vector<ll> exprs(M);
    for (auto& n: exprs) cin >> n, --n;
    
    priority_queue<piii, vector<piii>, less<piii>> pq; 
    ll ans = -1;
    for (int i = 0; i < M - 1; i++) {
        ll tNow = limit - vB * exprs[i];
        if (tNow < 0) break;
        ans++;    
    
        ll nxtA = min(tNow / vA + exprs[i], exprs[i + 1] - 1);
        ans += nxtA - exprs[i];

        ll xC = (tNow - (nxtA + 1 - exprs[i]) * vC < 0 ? nxtA : nxtA + 1); 
        ll tC = tNow - (xC - exprs[i]) * vC;
        ll possible = min(xC + tC / vA, exprs[i + 1] - 1);
        if (possible - nxtA <= 0) continue;
        
        pq.push({possible - nxtA, make_pair(xC, tC)});
    }


    while (pq.size() && K) {
        auto [dx, xt] = pq.top();
        auto& [x, t] = xt;
        pq.pop();
        K--;
        
        ans += dx;
        ll nxtExp = *upper_bound(exprs.begin(), exprs.end(), x);
        
        ll nxtA = x + t / vA;
        ll xC = (t - (nxtA - x + 1) * vC < 0 ? nxtA : nxtA + 1);
        ll tC = t - (xC - x) * vC;

        ll possible = min(xC + tC / vA, nxtExp - 1);
        if (possible - nxtA == 0) continue;
        pq.push({possible - nxtA, make_pair(xC, tC)});
    }

    if (vB * exprs.back() <= limit) ans++;
    cout << ans << '\n';

    return 0;   
}

Compilation message (stderr)

semiexpress.cpp: In function 'int main()':
semiexpress.cpp:51:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   51 |         auto [dx, xt] = pq.top();
      |              ^
semiexpress.cpp:52:15: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   52 |         auto& [x, t] = xt;
      |               ^

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