Submission #607208

#	Time	Username	Problem	Language	Result	Execution time	Memory
607208		Koosha_mv	Roller Coaster Railroad (IOI16_railroad)	C++14	100 / 100	231 ms	67532 KiB

railroad

#include "railroad.h"
#include <bits/stdc++.h>
using namespace std;
#define dbgv(v) cout<<#v<<" = "; f(i,0,int(v.size())) cout<<v[i]<<" "; cout<<endl
#define dbga(a,x,y) cout<<#a<<" = "; f(i,x,y) cout<<a[i]<<" "; cout<<endl
#define erorp(x) cout<<#x<<"={"<<x.F<<" , "<<x.S<<"}"<<endl
#define eror(x) cout<<#x<<'='<<(x)<<endl
#define f_(i,a,b) for(int i=a;i>=b;i--)
#define f(i,a,b) for(int i=a;i<b;i++)
#define nb(x) __builtin_popcount(x)
#define all(v) v.begin(),v.end()
#define bit(n,k) (((n)>>(k))&1)
#define Add(x,y) x=(x+y)%mod
#define maxm(a,b) a=max(a,b)
#define minm(a,b) a=min(a,b)
#define lst(x) x[x.size()-1]
#define sz(x) int(x.size())
#define mp make_pair
#define ll long long
#define pb push_back
#define S second
#define F first

const int N=1e6+99,inf=1e9+99;

int n,m,cnt,f[N],in[N],out[N],vis[N];
ll ans;
vector<int> ga[N],gb[N];

int getpar(int u){
    if(f[u]<0) return u;
    return f[u]=getpar(f[u]);
}
void merge(int u,int v,int w=0){
    u=getpar(u),v=getpar(v);
    if(u==v) return ;
    if(f[u]>f[v]) swap(u,v);
    f[u]+=f[v];
    f[v]=u;
    ans+=w;

}
void add(int u,int v,int t){
    in[v]+=t;
    out[u]+=t;
}

ll plan_roller_coaster(vector<int> s,vector<int> t) {
    vector<pair<int,pair<int,int>>> edge;
    vector<int> vec;
    fill(f,f+N,-1);
    f(i,0,s.size()) vec.pb(s[i]),vec.pb(t[i]);
    sort(all(vec));
    vec.resize(unique(all(vec))-vec.begin());
    n=vec.size();
    f(i,0,s.size()){
        int u=lower_bound(all(vec),s[i])-vec.begin(),v=lower_bound(all(vec),t[i])-vec.begin();
        merge(u,v);
        add(u,v,1);
    }
    merge(0,n-1);
    add(n-1,0,1);
    f(i,0,n-1){
        if(in[i]==out[i]){
            edge.pb({vec[i+1]-vec[i],{i,i+1}});
            continue ;
        }
        merge(i,i+1);
        if(in[i]<out[i]){
            ans+=1ll*(out[i]-in[i])*(vec[i+1]-vec[i]);
            add(i+1,i,out[i]-in[i]);
        }
        if(in[i]>out[i]){
            add(i,i+1,in[i]-out[i]);
        }
    }
    sort(all(edge));
    for(auto [w,e] : edge){
        merge(e.F,e.S,w);
    }
    return ans;
}
/*
3
0 5
1 2
3 4
*/

Compilation message (stderr)

railroad.cpp: In function 'long long int plan_roller_coaster(std::vector<int>, std::vector<int>)':
railroad.cpp:9:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    9 | #define f(i,a,b) for(int i=a;i<b;i++)
......
   52 |     f(i,0,s.size()) vec.pb(s[i]),vec.pb(t[i]);
      |       ~~~~~~~~~~~~             
railroad.cpp:52:5: note: in expansion of macro 'f'
   52 |     f(i,0,s.size()) vec.pb(s[i]),vec.pb(t[i]);
      |     ^
railroad.cpp:9:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    9 | #define f(i,a,b) for(int i=a;i<b;i++)
......
   56 |     f(i,0,s.size()){
      |       ~~~~~~~~~~~~             
railroad.cpp:56:5: note: in expansion of macro 'f'
   56 |     f(i,0,s.size()){
      |     ^
railroad.cpp:78:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   78 |     for(auto [w,e] : edge){
      |              ^

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