1738B - Prefix Sum Addicts - CodeForces Solution

constructive algorithms math sortings

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Python Code: 

for _ in range(int(input())):
    a=[int(i) for i in input().split()]
    b=[int(i) for i in input().split()]
    c=[]
    if a[1]==1:
        print("YES")
        continue
        for i in range(1,a[1]):
        c.append(b[i]-b[i-1])
        if c!=sorted(c,reverse=False):
        print("NO")
        continue
    if c[0]*(a[0]-a[1]+1)>=b[0]:
        print("YES")
    else:
        print("NO")

C++ Code: 

#include <bits/stdc++.h>
#define rep(i, a, n) for(int i=a; i<n ; i++)
#define ll long long
using namespace std;

void solve()
{
    int n,k;
    cin>>n>>k;
    int a[k];
    for(int i=0;i<k;i++){
        cin>>a[i];
    }
    vector<int>v;
    for(int i=k-1;i>0;i--){
        int x=a[i]-a[i-1];
        v.push_back(x);
    }
   
    int x=v[v.size()-1];
   
    
    

    int space=n-k+1;
    int x1=abs(a[0]);
    int m= x1/space;
    int l=x1%space;
    if(a[0]<0){
        // cout<<space<<" " <<x1<<endl;
        while(space--){
            v.push_back(-m);
        }
        int i=n-1;
        while(l-- && i>=0){
            v[i]-=1;
            i--;
        }

    }
    else{
        int i=v.size();
      while(space--){
            v.push_back(m);
      }
      while(l-- && i<v.size()){
        v[i]+=1;
        i++;

      }
    }
     reverse(v.begin(),v.end());
    // for(auto x:v){
    //     cout<<x<<" ";
    // }
for(int i=0;i<n-1;i++){
    if(v[i+1]<v[i]){
        cout<<"No"<<endl;
        return;
    }
}
cout<<"Yes";
    cout<<endl;


}

int main(){

   ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
   int t;
   cin>>t;
   while(t--)
   {
      solve();
   }
   return 0;
}


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