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

#define fastio()                      \
    ios_base::sync_with_stdio(false); \
    cin.tie(NULL);                    \
    cout.tie(NULL)
#define MOD 1000000007
#define MOD1 998244353
#define INF 1e18
#define nline "\n"
#define pb push_back
#define ppb pop_back
#define mp make_pair
#define fi first
#define se second
#define PI 3.141592653589793238462
#define set_bits __builtin_popcountll
#define sz(x) ((int)(x).size())
#define all(x) (x).begin(), (x).end()

typedef long long int ll;
typedef long double lld;
typedef unsigned long long ull;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef vector<int> vi;
typedef vector<ll> vll;

#define nl '\n';
#define pb push_back

vector<vector<int>> cordi = {{1, 0}, {0, 1}, {-1, 0}, {0, -1}};
bool istrue(int a, int b, int n, int m, vector<vector<int>> &vis)
{
    if (a >= 0 && b >= 0 && a < n && b < m && vis[a][b] == 0)
        return true;
    return false;
}
void solve()
{

    ll n, c;
    cin >> n >> c;
    int arr[n];
    map<int, int> mp;
    vector<pair<ll, ll>> cost2;
    for (int i = 0; i < n; i++)
    {
        cin >> arr[i];
        mp[i] = fmin(arr[i] + i + 1, arr[i] + n + 1 - (i + 1));
        cost2.push_back({arr[i] + i + 1, i});
    }
    
     for(auto & x:mp)  cout<<x.second<<" "<<x.first<<"\n";
     
     for(auto & x: cost2) cout<<x.second<<"  "<<x.first<<"\n";
    
    sort(cost2.begin(), cost2.end());
    int ans = 0;
    int i = 0;

    while (i < n && c >= cost2[i].first)
    {
        c -= cost2[i].first;
        ans++;
        i++;

        mp.erase(i);
        cost2.clear();
        break;
    }
     
     for(auto & x:mp)  cout<<x.second<<" "<<"\n";
    for (auto &x : mp)
        cost2.push_back({x.second, x.first});
        
          for(auto & x: cost2) cout<<x.second<<"  "<<x.first<<"\n";
    sort(cost2.begin(), cost2.end());

    i = 0;
    while (ans > 0  &&  i < (n - 1) && c >= cost2[i].first)
    {
        c -= cost2[i].first;
        ans++;
        i++;
    }

    cout << ans << "\n";
}
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    int t;
    cin >> t;
    while (t--)
    solve();

    return 0;
}
by

C++ Online Compiler

Write, Run & Share C++ code online using OneCompiler's C++ online compiler for free. It's one of the robust, feature-rich online compilers for C++ language, running on the latest version 17. Getting started with the OneCompiler's C++ compiler is simple and pretty fast. The editor shows sample boilerplate code when you choose language as C++ and start coding!

Read inputs from stdin

OneCompiler's C++ online compiler supports stdin and users can give inputs to programs using the STDIN textbox under the I/O tab. Following is a sample program which takes name as input and print your name with hello.

#include <iostream>
#include <string>
using namespace std;

int main() 
{
    string name;
    cout << "Enter name:";
    getline (cin, name);
    cout << "Hello " << name;
    return 0;
}

About C++

C++ is a widely used middle-level programming language.

  • Supports different platforms like Windows, various Linux flavours, MacOS etc
  • C++ supports OOPS concepts like Inheritance, Polymorphism, Encapsulation and Abstraction.
  • Case-sensitive
  • C++ is a compiler based language
  • C++ supports structured programming language
  • C++ provides alot of inbuilt functions and also supports dynamic memory allocation.
  • Like C, C++ also allows you to play with memory using Pointers.

Syntax help

Loops

1. If-Else:

When ever you want to perform a set of operations based on a condition If-Else is used.

if(conditional-expression) {
   //code
}
else {
   //code
}

You can also use if-else for nested Ifs and If-Else-If ladder when multiple conditions are to be performed on a single variable.

2. Switch:

Switch is an alternative to If-Else-If ladder.

switch(conditional-expression){    
case value1:    
 // code    
 break;  // optional  
case value2:    
 // code    
 break;  // optional  
......    
    
default:     
 code to be executed when all the above cases are not matched;    
}

3. For:

For loop is used to iterate a set of statements based on a condition.

for(Initialization; Condition; Increment/decrement){  
  //code  
}

4. While:

While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.

while (condition) {  
// code 
}

5. Do-While:

Do-while is also used to iterate a set of statements based on a condition. It is mostly used when you need to execute the statements atleast once.

do {  
 // code 
} while (condition);

Functions

Function is a sub-routine which contains set of statements. Usually functions are written when multiple calls are required to same set of statements which increases re-usuability and modularity. Function gets run only when it is called.

How to declare a Function:

return_type function_name(parameters);

How to call a Function:

function_name (parameters)

How to define a Function:

return_type function_name(parameters) {  
 // code
}