제출 #103076

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
103076		baluteshih	Roller Coaster Railroad (IOI16_railroad)	C++14	100 / 100	205 ms	33340 KiB

railroad

#include "railroad.h"
#include <bits/stdc++.h>
#define jizz ios::sync_with_stdio(0),cin.tie(0),cout.tie(0);
#define pb push_back
#define MP make_pair
#define F first
#define S second
#define ET cout << "\n"
#define MEM(i,j) memset(i,j,sizeof i)
#define ALL(v) v.begin(),v.end()
#define DB(a,s,e) {for(int i=s;i<e;++i) cerr << a[i] << " ";ET;}
using namespace std;
typedef long long ll;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;

struct mode
{
	ll p,v,i;
	bool operator<(const mode&x)const{
		return p<x.p;
	}
};

struct edge
{
	ll a,b,w;
	bool operator<(const edge&x)const{
		return w<x.w;
	}
};

ll boss[200005];

ll finds(ll a)
{
	if(a==boss[a]) return a;
	return boss[a]=finds(boss[a]);
}

void Union(ll a,ll b)
{
	a=finds(a),b=finds(b);
	if(a==b) return;
	boss[a]=b;
}

ll plan_roller_coaster(vector<int> s,vector<int> t) 
{
    ll n=s.size()+1,ans=0,nw=0;
    vector<mode> v;
    vector<pii> interesting;
    vector<edge> e;
    s.pb(1000000001),t.pb(1);
    for(int i=0;i<n;++i)
    	boss[i]=i,v.pb(mode{s[i],1,i}),v.pb(mode{t[i],-1,i});
	sort(ALL(v));
	for(int i=0,t=0;i+1<v.size();)
	{
		interesting.pb(MP(v[i].p,v[i].i));
		while(t<v.size()&&v[i].p==v[t].p)
			nw+=v[t].v,++t;
		if(nw>0)
			ans+=nw*(v[t].p-v[i].p);
		if(nw!=0)
			Union(v[t].i,v[i].i);
		for(++i;i<t;++i)
			Union(v[i-1].i,v[i].i);
	}
	for(int i=0;i+1<interesting.size();++i)
		if(finds(interesting[i].S)!=finds(interesting[i+1].S))
			e.pb(edge{interesting[i].S,interesting[i+1].S,interesting[i+1].F-interesting[i].F});
	sort(ALL(e));
	for(auto i:e)
		if(finds(i.a)!=finds(i.b))
			Union(i.a,i.b),ans+=i.w;
	return ans;
}

컴파일 시 표준 에러 (stderr) 메시지

railroad.cpp: In function 'll plan_roller_coaster(std::vector<int>, std::vector<int>)':
railroad.cpp:55:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
     for(int i=0;i<n;++i)
     ^~~
railroad.cpp:57:2: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
  sort(ALL(v));
  ^~~~
railroad.cpp:58:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0,t=0;i+1<v.size();)
                  ~~~^~~~~~~~~
railroad.cpp:61:10: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   while(t<v.size()&&v[i].p==v[t].p)
         ~^~~~~~~~~
railroad.cpp:70:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i+1<interesting.size();++i)
              ~~~^~~~~~~~~~~~~~~~~~~

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