Submission #1281236

#	Time	Username	Problem	Language	Result	Execution time	Memory
1281236		tunademayo	Marathon Race 2 (JOI24_ho_t3)	C++20	0 / 100	0 ms	332 KiB

Main

#include <bits/stdc++.h>
using namespace std;
using ll = long long;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    int N;
    long long L;
    if (!(cin >> N >> L)) return 0;
    vector<long long> X(N);
    for (int i = 0; i < N; ++i) cin >> X[i];

    // compress positions: map pos -> count
    map<long long,int> cntmap;
    for (auto x : X) cntmap[x]++;
    vector<long long> pos;
    vector<int> cnts;
    for (auto &p : cntmap) {
        pos.push_back(p.first);
        cnts.push_back(p.second);
    }
    int M = (int)pos.size();

    auto simulate_order = [&](long long S, long long G, bool goLeftFirst)-> long long {
        // build left/right indices relative to S
        vector<int> left_idx, right_idx;
        for (int i = 0; i < M; ++i) {
            if (pos[i] <= S) left_idx.push_back(i);
            else right_idx.push_back(i);
        }
        vector<int> visit; visit.reserve(M);
        if (goLeftFirst) {
            for (int i = (int)left_idx.size() - 1; i >= 0; --i) visit.push_back(left_idx[i]);
            for (int i = 0; i < (int)right_idx.size(); ++i) visit.push_back(right_idx[i]);
        } else {
            for (int i = 0; i < (int)right_idx.size(); ++i) visit.push_back(right_idx[i]);
            for (int i = (int)left_idx.size() - 1; i >= 0; --i) visit.push_back(left_idx[i]);
        }

        ll time = 0;
        ll curPos = S;
        ll carrying = 0;
        vector<bool> picked(M, false);

        // simulate visiting in this fixed order; pick only when we "visit" that position
        for (int idx : visit) {
            long long nextP = pos[idx];
            long long d = llabs(curPos - nextP);
            // movement cost: (carrying + 1) seconds per meter
            time += d * (carrying + 1);
            // arrive, pick all balls at nextP
            carrying += cnts[idx];
            time += cnts[idx]; // pick cost (1s per ball)
            picked[idx] = true;
            curPos = nextP;
        }
        // after collected all balls, move to G carrying all balls
        long long dlast = llabs(curPos - G);
        time += dlast * (carrying + 1);
        return time;
    };

    int Q;
    cin >> Q;
    for (int qi = 0; qi < Q; ++qi) {
        long long S, G, Tlim;
        cin >> S >> G >> Tlim;
        long long t1 = simulate_order(S, G, true);
        long long t2 = simulate_order(S, G, false);
        long long best = min(t1, t2);
        if (best <= Tlim) cout << "Yes\n"; else cout << "No\n";
    }
    return 0;
}

• Subtask 1: 0 / 7
• Subtask 2: 0 / 7
• Subtask 3: 0 / 10
• Subtask 4: 0 / 28
• Subtask 5: 0 / 10
• Subtask 6: 0 / 19
• Subtask 7: 0 / 19