Submission #1085299

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
1085299	2024-09-07 22:04:02	veehj	Railway Trip (JOI17_railway_trip)	C++17	100 / 100	419 ms	55896 KiB

railway_trip

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#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef long double ld;
#define F first
#define S second
#define pb push_back
#define sz(a) (ll)a.size()
#define all(x) (x).begin(), (x).end()
int main() {
    ll n, k, q; cin >> n >> k >> q;
    vector<ll> lvl(n); for(auto& u : lvl) cin >> u;
    vector<vector<vector<ll>>> stp(2, vector<vector<ll>>(n, vector<ll>(18, 0LL))); //v[left/right][place][2^?]=first point place will reach
    stack<ll> st;
    for(ll i=0; i<n; i++){
        while(!st.empty() && lvl[st.top()]<lvl[i]) st.pop();
        if(st.empty()) stp[0][i][0]=i;
        else stp[0][i][0]=st.top();
        st.push(i);
    }
    while(!st.empty()) st.pop();
    for(ll i=n-1; i>=0; i--){
        while(!st.empty() && lvl[st.top()]<lvl[i]) st.pop();
        if(st.empty()) stp[1][i][0]=i;
        else stp[1][i][0]=st.top();
        st.push(i);
    }
    for(int i=1; i<=17; i++){
        for(ll j=0; j<n; j++){
 
 
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• Subtask 1: 5 / 5
• Subtask 2: 15 / 15
• Subtask 3: 25 / 25
• Subtask 4: 55 / 55