i was trying the question https://mirror.codeforces.com/problemset/problem/839/C in python3 and wrote a recursive program when i submitted it,it gave runtime error i tried changing recursion depth(although when i saw the test cases it passed a case with n=100000 and gave RE on n=90000) . it still didn't work then i wrote the same code in cpp and it got excepted . the same thing also happened on https://mirror.codeforces.com/problemset/problem/580/C where there was some problem with recursion not working properly .can anybody tell what is going wrong.

python code for Journey

import math import time from collections import defaultdict,deque from sys import stdin,stdout from bisect import bisect_left,bisect_right from queue import PriorityQueue import sys sys.setrecursionlimit(10**5) def find(curr,parent,prob,plen): leaf=True for i in graph[curr]: if(i!=parent): if(curr!=1): find(i,curr,prob/(len(graph[curr])-1),plen+1) else: find(i,curr,prob/(len(graph[curr])),plen+1) leaf=False if(leaf): ans[0]+=prob*plen n=int(stdin.readline()) graph=defaultdict(lambda:[]) for i in range(n-1): u,v=map(int,stdin.readline().split()) graph[u].append(v) graph[v].append(u) ans=[0] find(1,-1,1,0) print(ans[0])

cpp code(Working) for Journey

using namespace std; const long long A = 100000000000000LL, N = 10e5 +10;

vector a[N]; long long c[N], x, y, i, j, n, m; double o = 0.0;

void go(int v, int pr, double prob, int len) { bool leaf = 1; for (int i = 0; i < a[v].size(); i++) if (a[v][i] != pr) { leaf = 0; if (v != 0) go(a[v][i], v, prob / double(a[v].size() — 1), len + 1); else go(a[v][i], v, prob / double(a[v].size()), len + 1); } if (leaf) o += prob * len; }

int main() { cin >> n; for (i = 0; i < n — 1; i++) { scanf("%d%d", &x, &y), x--, y--, a[x].pb(y), a[y].pb(x); } go(0, -1, 1.0, 0); cout << fixed << setprecision(9) << o << "\n"; }

python code for Kefa and Park

import math import time from collections import defaultdict,deque from sys import stdin,stdout import sys from bisect import bisect_left,bisect_right final=[0] sys.setrecursionlimit(100010) def find(curr,parent,cats): if(cats>m): return ok=1 for i in graph[curr]: if(i!=parent): ok=0 find(i,curr,cats*a[i]+a[i]) final[0]+=ok

n,m=map(int,stdin.readline().split()) a=list(map(int,stdin.readline().split())) graph=defaultdict(lambda:[]) for _ in range(n-1): x,y=map(int,stdin.readline().split()) x-=1 y-=1 graph[x].append(y) graph[y].append(x) find(0,-1,a[0]) print(final[0])

cpp code(Working) for Kefa and Park

using namespace std; const long long A=100000000000000LL,N=228228;

vector a[N]; long long c[N],o,x,y,i,j,n,m;

void go(int v,int pr,int k){ if(k>m)return; int ok=1; for(int i=0;i<a[v].size();i++)if(a[v][i]!=pr)ok=0,go(a[v][i],v,k*c[a[v][i]]+c[a[v][i]]); o+=ok; }

int main(){ cin>>n>>m; for(i=0;i<n;i++)scanf("%d",&c[i]); for(i=1;i<n;i++)scanf("%d%d",&x,&y),x--,y--,a[x].pb(y),a[y].pb(x); go(0,-1,c[0]); cout<<o<<"\n"; }