Submission #1203741

#TimeUsernameProblemLanguageResultExecution timeMemory
1203741onbertRoller Coaster Railroad (IOI16_railroad)C++20
30 / 100
169 ms38884 KiB
#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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