Submission #524647

#	Time	Username	Problem	Language	Result	Execution time	Memory
524647		ammar2000	Dynamic Diameter (CEOI19_diameter)	C++17	11 / 100	5082 ms	16448 KiB

diameter

#include<bits/stdc++.h>
#define ll long long
#define pb push_back
#define F first
#define S second
#define coy cout<<"YES\n"
#define con cout<<"NO\n"
#define co1 cout<<"-1\n"
#define sc(x) scanf("%lld",&x)
#define all(x) x.begin(),x.end()
#define fast ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
using namespace std;
const int SI=3e5+7;
ll INF=8e18+7;
int dx[] = {1 , -1 , 0 , 0};
int dy[] = {0 , 0 , 1 , -1};
int MOD=1e9+7;
ll n,q,w,last,len[SI];
ll vis[SI],c,ans;
vector < pair < ll,ll> > v[SI];
void dfs(int node,ll dep)
{
    vis[node]=c;
    ans=max(ans,dep);
    for (auto i:v[node])
    {
        if (vis[i.F]==c)
            continue ;
        dfs(i.F,dep+len[i.S]);
    }
}
void DFS()
{
    for (int i=1;i<=n;i++)
        c++,dfs(i,0);
    cout << ans<<"\n";
}
int main()
{
   fast
   cin>>n>>q>>w;
   for (int i=0;i<n-1;i++)
   {
       ll a,b,c;
       cin>>a>>b>>c;
       len[i]=c;
       v[a].pb({b,i});
       v[b].pb({a,i});
   }
   while (q--)
   {
       ll d,e;
       cin>>d>>e;
       d=(d+last)%(n-1);
       e=(e+last)%w;
       len[d]=e;
       ans=-1;
       c++;
       //for (int i=0;i<n-1;i++)\
        cout<< len[i]<<" ";\
       cout <<"\n";
       DFS();
       last=ans;
   }
   return 0;
}

Compilation message (stderr)

diameter.cpp:59:8: warning: multi-line comment [-Wcomment]
   59 |        //for (int i=0;i<n-1;i++)\
      |        ^

• Subtask 1: 11 / 11
• Subtask 2: 0 / 13
• Subtask 3: 0 / 7
• Subtask 4: 0 / 18
• Subtask 5: 0 / 24
• Subtask 6: 0 / 27