https://en.m.wikipedia.org/wiki/Sieve_of_Eratosthenes

Go through the Wikipedia article for sieve of eratosthenes for better understanding of computational and algorithmic complexity.

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Ashish SBLearning. · 1y

https://en.m.wikipedia.org/wiki/Sieve_of_Eratosthenes

Go through the Wikipedia article for sieve of eratosthenes for better understanding of computational and algorithmic complexity.

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Ashish SBLearning. · 1y

Be careful of mod of negative values.

F(n) is always >= F(m)

But F(n)mod(10^9+7) is not always >= F(m)mod(10^9+7).

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Ashish SBLearning. · 2y

There seems to be some issue with input cases in this problem, so don't generalise this to other problems. Best of luck!

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Ashish SBLearning. · 2y

Since the id numbers are not duplicate one could , pre sort and then maintain 2 pointers to find the number of similar numbers in the id in O(n) time.

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Ashish SBLearning. · 2y

Beautiful problem :>

Apart from the nice hints given by Tanavya Dimri and Kuntal Majumder , here's my way of putting it :-

Root the tree at a singe point ,consider 1 for simplicity.

Now the tree can be divided into one of the following 3 sub trees:

- The Whole Tree rooted at 1 - one of its's adjacent connected subtree AND the subtree in-turn cut into two .
- The Whole Tree rooted at 1 - one of the vertex weight in the path to its connected subtree - one of the other adjacent connected subtree, the one of the other adjacent connected and the subtree rooted at one of the vertex weight in the path from 1 .

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Ashish SBLearning. · 2y

According to your implementation you have considered paths that lead to a[1] and a[2], since you have started your initial paths either from n or n-1, if minimum of sum1=min(min_ar[1],min_ar[2]) comes to be min_ar[1] then this would be the solution since it will satisfy the condition that at least one of the adjacent knights get their dishes, now when min_ar[2] is lesser we have to check for the condition that in you paths we have to choose a[n] cause we are not considering a[1] (since a[1] and a[n] are adjacent , because of circular condition) and also path for a[n-2] should come from a[n] and a[n-3] will be

min_ar[n-3]=ar[n-3]+min(min_ar[n-2],ar[n]+ar[n-1]);

hope this helped:)

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Ashish SBLearning. · 2y

@Sushrut you are almost there , your logic seems to be almost correct.

I have made as few a changes in your code so that your idea remains the same and handled a boundary case.

Please look into the code with comments for where i have made the changes.

#include<bits/stdc++.h>using namespace std;int main(int argc , char **argv){int n , sum1 = 0,sum2 = 0 ;cin >> n;int ar[n+1] , min_ar[n+1],path[n+1] ;for(int i = 1 ; i <= n ; i++){cin >> ar[i];}if(n == 1){cout << ar[1] ;return 0 ;}if(n == 2){cout << min(ar[1 ] , ar[2]);return 0;}if(n==3){

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Ashish SBLearning. · 2y

Call a dfs for all the employees of the boss , track the maximum wealth up to a level and maintain a max answer , max(ans,maximum_till_now-wealth[i])

#include<iostream>#include<bits/stdc++.h>using namespace std;#define ll long long intint w[100001];vector<int> adj[100001];int ans=0;void dfs(int s, vector<int> adj[],int mx){ans=max(ans,mx-w[s]);mx=max(mx,w[s]);vector<int>::iterator it;for(it=adj[s].begin();it!=adj[s].end();it++){

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Ashish SBLearning. · 2y

BFS would be the obvious choice(though one could also implement using dfs). The last test case gives segment fault :/

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Ashish SBLearning. · 2y

What you could do is maintain a vector of cycles and push elements to it in your first loop itself where you are counting the number of cycles.

cycles[counts].push_back(j);

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