Sum of ones

input/code.cpp: In function 'int findk(int)':
input/code.cpp:12:10: warning: 'k' may be used uninitialized in this function [-Wmaybe-uninitialized]
   12 |   return k;
      |          ^
input/code.cpp: In function 'int countSetBits(int)':
input/code.cpp:22:5: warning: 'k' may be used uninitialized in this function [-Wmaybe-uninitialized]
   22 |     for (int i = k; i >= 0; i--)
      |     ^~~

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

int findk(int n)
{ int k; int i=0; int val=pow(2,i);
   
 while(val<=n)
 { 
     k=i; i++;
    val=pow(2,i);
 }
  return k;
}
 
// Function to count set bits in a number
int countSetBits(int N)
{
    int count = 0;
    int k=findk(N);
    int val , x;

    for (int i = k; i >= 0; i--)
    {
        val=pow(2,i);
        x=val & N;
       
       if(x > 0)
       { count++;
       }
    }
    return count;
}

int main() {
    cin.tie(0)->sync_with_stdio(0);
    int n;
    cin >> n;
    vector<int> dp(n+1, 0);
    
    for (int i = 1; i <= n; i++){
        dp[i] = countSetBits(i) + dp[i-1];
    }
    
    cout << dp[n];

    return 0;
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED

Test 6

Verdict: ACCEPTED

Test 7

Verdict: ACCEPTED

Test 8

Verdict: ACCEPTED

Test 9

Verdict: ACCEPTED

Test 10

Verdict: ACCEPTED

Test 11

Verdict: RUNTIME ERROR

terminate called after throwing an instance of 'std::length_error'
  what():  cannot creat...

Test 12

Verdict: RUNTIME ERROR

terminate called after throwing an instance of 'std::length_error'
  what():  cannot creat...

Test 13

Verdict: RUNTIME ERROR

terminate called after throwing an instance of 'std::length_error'
  what():  cannot creat...

Test 14

Verdict: RUNTIME ERROR

terminate called after throwing an instance of 'std::length_error'
  what():  cannot creat...

Test 15

Verdict: RUNTIME ERROR

terminate called after throwing an instance of 'std::length_error'
  what():  cannot creat...

Test 16

Verdict: RUNTIME ERROR

terminate called after throwing an instance of 'std::length_error'
  what():  cannot creat...

Test 17

Verdict: RUNTIME ERROR

terminate called after throwing an instance of 'std::length_error'
  what():  cannot creat...

Test 18

Verdict: RUNTIME ERROR

terminate called after throwing an instance of 'std::length_error'
  what():  cannot creat...

Test 19

Verdict: RUNTIME ERROR

terminate called after throwing an instance of 'std::length_error'
  what():  cannot creat...

Test 20

Verdict: RUNTIME ERROR

terminate called after throwing an instance of 'std::length_error'
  what():  cannot creat...

Test 21

Verdict: RUNTIME ERROR

terminate called after throwing an instance of 'std::length_error'
  what():  cannot creat...