Submission #1361043

#	Time	Username	Problem	Language	Result	Execution time	Memory
1361043		eyadooz	Magic Tree (CEOI19_magictree)	C++20	Compilation error	0 ms	0 KiB

magictree

#include<bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;

#define pb push_back
#define all(x) (x).begin(), (x).end()
#define sz(x) (int) (x).size()
#define endl '\n'
#define int long long
int fa[200005], a[200005], dp[200005][2];
vector<int> adj[200005];
void init(int x, int p=-1) 
{
    dp[x][a[x]]+=fa[x];
    for(auto i : adj[x]) 
    {
        if(i==p) continue;
        init(i, x);
        for(int j = 1;j<=20;j++) 
        {
            int cnt=0;
            for(int k=1;k<=j;k++) 
            {
                cnt=max(cnt, dp[i][k]);
            }
            dp[x][j]+=cnt;
        }
    }
}
main()
{
    cin.tie(0) -> sync_with_stdio(0);

    int n, m, k;
    cin >> n >> m >> k;
    int p[n+5]={}, sum=0;
    bool f=0;
    for(int i = 2;i <= n;i++) 
    {
        cin>> p[i];
        adj[i].pb(p[i]);
        adj[p[i]].pb(i);
        if(p[i]!=i-1) f=1;
    }
    for(int i = 0;i < m;i++) 
    {
        int v, d, w;
        cin >> v >> d >> w;
        a[v]=d;
        fa[v]=w;
        sum+=w;
    }
    if(k<=20) 
    {
        init(1);
        for(int i = 0;i <= 20;i++) ans=max(ans, dp[1][i]);
        cout << ans;
        return 0;
    }
    if(f) {cout << sum;return 0;}
    vector<int> v;
    for(int i = n;i>=1;i--) 
    {
        if(a[i]==0) continue;
        auto it=upper_bound(all(v), a[i]);
        if(it==v.end()) v.pb(a[i]);
        else *it=a[i];
    }
    cout << sz(v);
}   
    

Compilation message (stderr)

magictree.cpp:33:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   33 | main()
      | ^~~~
magictree.cpp: In function 'int main()':
magictree.cpp:59:36: error: 'ans' was not declared in this scope; did you mean 'abs'?
   59 |         for(int i = 0;i <= 20;i++) ans=max(ans, dp[1][i]);
      |                                    ^~~
      |                                    abs
magictree.cpp:60:17: error: 'ans' was not declared in this scope; did you mean 'abs'?
   60 |         cout << ans;
      |                 ^~~
      |                 abs