Submission #88687

#	Time	Username	Problem	Language	Result	Execution time	Memory
88687		amiratou	Roller Coaster Railroad (IOI16_railroad)	C++14	0 / 100	141 ms	16560 KiB

railroad

#include <bits/stdc++.h>
using namespace std;
#define boost ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0)
#define debug(x) cerr << " - " << #x << ": " << x << endl;
#define debugs(x, y) cerr << " - " << #x << ": " << x << " " << #y << ": " << y << endl;
#define sep() cerr << "--------------------" << endl;
#define all(x) (x).begin(),(x).end()
#define sz(x) (ll)x.size()
#define fi first
#define se second
#define ll long long
#define ii pair<int,int>
#define v vector<int>
#define vv vector<vector<int> >
#define pb push_back
#define INF 15
using namespace std;
vector<ii> vec;
v speed,ex;
int tab[200005],n,matched[200005];
bool seen[200005];
bool solve(int node){
	for (int i = tab[node]; i < n; ++i)
	{
		if(!seen[vec[i].fi]&&vec[i].se!=node){
			seen[vec[i].fi]=1;
			if(matched[vec[i].fi]==-1||solve(vec[i].fi)){
				matched[vec[i].fi]=node;
				return 1;
			}
			seen[node]=0;
		}
	}
	return 0;
}
long long plan_roller_coaster(std::vector<int> s, std::vector<int> t) {
	memset(matched,-1,sizeof matched);
    n = (int) s.size();
    speed=s;
    ex=t;
    for (int i = 0; i < n; ++i)
    	vec.pb({s[i],i});
    sort(all(vec));
    int found_last=0,id;
    for (int i = 0; i < n; ++i)
    {
    	auto search=upper_bound(all(vec),make_pair(t[i],0));
    	if(search==vec.end()){
    		search--;
    		if(search->fi!=t[i]){if(!found_last){found_last++;tab[i]=-1;id=i;}else return INF;}
    		else{
    			tab[i]=(search-vec.begin());
    			//debug(tab[i]);
    			continue;
    		}
    	}
    	if(search==vec.begin()){
    		tab[i]=search-vec.begin();
    		continue;
    	}
    	search--;
    	if(search->fi!=t[i])search++;
    	tab[i]=(search-vec.begin());
    }
    for (int i = 0; i < n; ++i)
    {
    	if(!solve(i)&&i!=id)
    		return INF;
    }
    return 0;
    //return ((solve(0)==1)?0:INF);
}

Compilation message (stderr)

railroad.cpp: In function 'long long int plan_roller_coaster(std::vector<int>, std::vector<int>)':
railroad.cpp:67:18: warning: 'id' may be used uninitialized in this function [-Wmaybe-uninitialized]
      if(!solve(i)&&i!=id)
         ~~~~~~~~~^~~~~~~

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