#include "railroad.h"
#include <bits/stdc++.h>
using namespace std;
#define int long long
const int INF = 1e9;
const int maxn = 4e5 + 5;
int sz;
vector<int> vals = {-INF};
int dc(int x) {return lower_bound(vals.begin(), vals.end(), x) - vals.begin();}
int n;
vector<int> adj[maxn];
int sum[maxn];
bool vis[maxn];
void dfs(int u) {
vis[u] = true;
for (int v:adj[u]) if (!vis[v]) dfs(v);
}
long long plan_roller_coaster(vector<int32_t> s, vector<int32_t> t) {
s.push_back(INF); t.push_back(1);
n = s.size();
for (int i=0;i<n;i++) {
vals.push_back(s[i]); vals.push_back(t[i]);
}
sort(vals.begin(), vals.end());
vals.erase(unique(vals.begin(), vals.end()), vals.end());
sz = vals.size() - 1;
for (int i=0;i<n;i++) s[i] = dc(s[i]), t[i] = dc(t[i]);
for (int i=0;i<n;i++) adj[s[i]].push_back(t[i]);
for (int i=0;i<n;i++) sum[s[i]]++, sum[t[i]]--;
for (int i=sz;i>=1;i--) {
// cout << i << " " << sum[i] << endl;
if (sum[i] < 0) return 1;
if (sum[i] > 0) {
adj[i-1].push_back(i);
// cout << i << endl;
}
sum[i-1] += sum[i];
}
dfs(1);
for (int i=1;i<=sz;i++) {
// cout << i << " " << vis[i] << endl;
if (!vis[i]) return 1;
}
// cout << endl;
return 0;
}
Compilation message (stderr)
railroad.h:1:9: warning: #pragma once in main file
1 | #pragma once
| ^~~~
railroad_c.h:1:9: warning: #pragma once in main file
1 | #pragma once
| ^~~~
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