CODECHEF SOLUTION

Week 1: Codechef Practice

1. Total Prize Money: PRIZEPOOL

link: PRIZEPOOL

#include <iostream>
using namespace std;

int main() {
	int txP;
	cin>>txP;
	for(int index=0;index<txP;index++)
	{
	    int xx,yx;
	    cin>>xx>>yx;
	    cout<<10*xx+90*yx<<endl;
	}
	return 0;

}

2. My very 1st contest: MY1STCONTEST

link: MY1STCONTEST

#include <iostream>
using namespace std;

int main() {
	// your code goes here
	int n,a,b;
	cin>>n>>a>>b;
	int p=n-a;
	int k=p-b;
	
	cout<<p<<" ";
	cout<<k<<endl;
	return 0;
}

3. Mutated Minions: CHN15A

link: CHN15A

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

#define fin(a, b) for(ll i = a; i < b; i++)
#define fdec(a, b) for(ll i = a; i > b; i--)
#define ll long long
#define vl vector<ll>
#define pb push_back
#define FAST ios::sync_with_stdio(false); cin.tie(0)
const long long M = 1e9 + 7;

signed main()
{
    FAST;
    ll t;
    cin >> t;
    while (t--) {
        ll n, k;
        cin >> n >> k;
        vector<ll> v(n);
        for (auto &i: v) cin >> i;
        ll c = 0;
        for (ll i = 0; i < n; i++) {
            v[i] += k;
            if (v[i] % 7 == 0) ++c;
        }
        cout << c << '\n';
    }
    return 0;
}

4. Primality Test Problem: PRB01

link: PRB01

#include <iostream>
using namespace std;
#define endl '\n'

int main()
{
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    int n,t,i,y;
    cin>>t;
    while(t--)
    {
        cin>>n;
        if(n==1)
            cout<<"no"<<endl;
        else{
            y=0;
            for(i=2; i*i<=n; i++)
            {
                if(n%i==0)
                {
                    y=1;
                    break;
                }
            }
            if(y==0)
                cout<<"yes"<<endl;
            else
                cout<<"no"<<endl;
        }

    }
    return 0;

}

5. Degree of Polynomial: DPOLY

link: DPOLY

#include <iostream>
using namespace std;
int main() 
{
    int a,t;
    cin>>t;
    for(a=0;a<t;a++)
    {
        int n,a[1000],i;
        cin>>n;
        for(i=0;i<n;i++)
        {
            cin>>a[i];
        }
        for(i=n-1;i>=0;i--)
        {
            if(a[i]!=0)
            {
                break;
            }
        }
        cout<<i<<endl;
        
    }
    return 0;
}