Submission #1104431

#	Time	Username	Problem	Language	Result	Execution time	Memory
1104431		vivkostov	Stranded Far From Home (BOI22_island)	C++14	100 / 100	186 ms	42488 KiB

island

#include<bits/stdc++.h>
#define endl '\n'
using namespace std;
void speed()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
}
struct cell
{
    long long int st,in;
};
bool cmp(cell a1,cell a2)
{
    return a1.st<a2.st;
}
long long int n,m,l,r,lead[200005],sz[200005],lamp[200005],st[200005],otg[200005];
vector<int>valid[200005],v[200005];
cell a[200005];
void prec()
{
    for(int i=1;i<=n;i++)
    {
        lead[i]=i;
        sz[i]=1;
        st[i]=a[i].st;
        valid[i].push_back(i);
    }
}
int get_lead(int beg)
{
    if(lead[beg]==beg)return beg;
    return get_lead(lead[beg]);
}
void ad(int a,int b)
{
    a=get_lead(a);
    b=get_lead(b);
    if(a==b)return;
    if(sz[a]<sz[b])swap(a,b);
    lead[b]=lead[a];
    sz[a]+=sz[b];
    st[a]+=st[b];
    for(int i=0;i<valid[b].size();i++)
    {
        valid[a].push_back(valid[b][i]);
    }
}
void rem(int in,long long int tresh)
{
    in=get_lead(in);
    if(st[in]<tresh)
    {
        valid[in].clear();
    }
}
void add(int a,long long int tresh)
{
    lamp[a]=1;
    for(int i=0;i<v[a].size();i++)
    {
        if(lamp[v[a][i]])
        {
            rem(v[a][i],tresh);
            ad(a,v[a][i]);
        }
    }
}
void read()
{
    cin>>n>>m;
    for(int i=1;i<=n;i++)
    {
        cin>>a[i].st;
        a[i].in=i;
    }
    for(int i=1;i<=m;i++)
    {
        cin>>l>>r;
        v[l].push_back(r);
        v[r].push_back(l);
    }
    prec();
    sort(a+1,a+n+1,cmp);
    for(int i=1;i<=n;i++)
    {
        add(a[i].in,a[i].st);
    }
    int f=get_lead(1);
    for(int i=0;i<valid[f].size();i++)
    {
        otg[valid[f][i]]=1;
    }
    for(int i=1;i<=n;i++)
    {
        cout<<otg[i];
    }
    cout<<endl;
}
int main()
{
    speed();
    read();
    return 0;
}

Compilation message (stderr)

island.cpp: In function 'void ad(int, int)':
island.cpp:45:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   45 |     for(int i=0;i<valid[b].size();i++)
      |                 ~^~~~~~~~~~~~~~~~
island.cpp: In function 'void add(int, long long int)':
island.cpp:61:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   61 |     for(int i=0;i<v[a].size();i++)
      |                 ~^~~~~~~~~~~~
island.cpp: In function 'void read()':
island.cpp:91:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   91 |     for(int i=0;i<valid[f].size();i++)
      |                 ~^~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 15 / 15
• Subtask 4: 30 / 30
• Subtask 5: 35 / 35