Submission #575519

#	Time	Username	Problem	Language	Result	Execution time	Memory
575519		definitelynotmee	Roller Coaster Railroad (IOI16_railroad)	C++98	0 / 100	761 ms	49460 KiB

railroad

#include<bits/stdc++.h>
#include"railroad.h"
#define mp make_pair
#define mt make_tuple
#define all(x) x.begin(), x.end()
#define ff first
#define ss second
using namespace std;
template <typename T>
using matrix = vector<vector<T>>;
typedef unsigned int uint;
typedef unsigned long long ull;
typedef long long ll;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;
const ll INFL = (1LL<<62)-1;
const int INF = (1<<30)-1;
const double EPS = 1e-7;
const int MOD = 1e9 + 7;
const int RANDOM = chrono::high_resolution_clock::now().time_since_epoch().count();
const int MAXN = 1e6+1;

long long plan_roller_coaster(std::vector<int> s, std::vector<int> t) {
    int n = s.size();
    set<int> vals;
    vals.insert(0);
    vals.insert(INF);

    for(int i = 0; i < n; i++){
        vals.insert(s[i]);
        vals.insert(t[i]);
    }
    map<int,int> dic;

    for(int i : vals)
        dic[i] = dic.size();
    int m = dic.rbegin()->ss;

    vector<int> indegree(m+2), outdegree(m+2);
    vector<int> delta(m+2);
    for(int i = 0; i < n; i++){
        delta[dic[s[i]]]--;
        delta[dic[t[i]]]++;
        outdegree[dic[s[i]]]++;
        indegree[dic[t[i]]]++;
    }
    int cur = 0;
    for(int i = 0; i <= m; i++){
        cur+=delta[i];
        outdegree[i]+=cur;
        indegree[i+1]+=cur;
    }
    bool ok = outdegree[0] == 1 && indegree[m] == 1;
    for(int i = 1; i < m; i++){
        ok&=indegree[i] == outdegree[i];
    }
    return ok^1;
}

• Subtask 1: 0 / 11
• Subtask 2: 0 / 23
• Subtask 3: 0 / 30
• Subtask 4: 0 / 36