Submission #865923

#	Time	Username	Problem	Language	Result	Execution time	Memory
865923		HuyQuang_re_Zero	Teleporters (IOI08_teleporters)	C++14	100 / 100	287 ms	65536 KiB

teleporters

#include <bits/stdc++.h>
#define ll long long
#define db long double
#define N 1000005
#define II pair <int,int>
#define III pair <ll,II>
#define IV pair <vector <int>,vector <int> >
#define fst first
#define snd second
#define BIT(x,i) ((x>>i)&1)
#define Log(x) (31-__builtin_clz((int)x))
#define LogLL(x) (63-__builtin_clzll((ll)x))
#define pi acos(-1)
#define to_radian(x) (x*pi/180.0)
#define to_degree(x) (x*180.0/pi)
using namespace std;
int n,m,End[2*N],From[2*N],i,u,sz,l,r,res,nxt[2*N],node,last,cnt[2*N];
bool visited[2*N];
int a[2*N],pos[2*N];
int rev(int u) { return (u<=n) ? u+n : u-n; }
void Radix_sort(int a[],int &n)
{
    memset(cnt,0,sizeof(cnt));
    for(i=1;i<=n;i++) cnt[a[i]]++;
    n=0;
    for(i=0;i<=2000001;i++)
        while(cnt[i]--) a[++n]=i;
}
int main()
{
 //   freopen("teleporters.inp","r",stdin);
   // freopen("teleporters.out","w",stdout);
    cin>>n>>m;
    a[++sz]=0; pos[0]=0;
    a[++sz]=2000001; pos[2000001]=2*n+1;
    for(i=1;i<=n;i++)
    {
        scanf("%d%d",&l,&r);
        a[++sz]=l; pos[l]=i;
        a[++sz]=r; pos[r]=rev(i);
    }
    Radix_sort(a,sz);
    for(i=2;i<=sz;i++) End[++node]=pos[a[i]],From[pos[a[i-1]]]=node;
    for(u=1;u<=node;u++) nxt[u]=From[rev(End[u])];
    for(u=1;u<node;u=nxt[u]) visited[u]=1,res++;
    visited[node]=1;


    vector <int> val;
    for(u=2;u<=node;u++)
        if(visited[u]==0)
        {
            int v=nxt[u],edge=0;
            while(v!=u) visited[v]=1,edge++,v=nxt[v];
            visited[v]=1,edge++;
            val.push_back(edge);
        }

    sort(val.begin(),val.end());
    for(i=1;i<=m;i++)
        if(val.size()>0)
        {
            int k=val.back(); val.pop_back();
            res+=k+2;
        }
        else
        {
            res++;
            val.push_back(1);
        }
    cout<<res;
}

Compilation message (stderr)

teleporters.cpp: In function 'int main()':
teleporters.cpp:38:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   38 |         scanf("%d%d",&l,&r);
      |         ~~~~~^~~~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 5 / 5
• Subtask 3: 5 / 5
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• Subtask 20: 5 / 5