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Check if a number can be expressed as a sum of consecutive numbers in C++
Here we will see if one number can be represented as sum of two or more consecutive numbers or not. Suppose a number is 12. This can be represented as 3+4+5.
There is a direct and easiest method to solve this problem. If a number is power of 2, then it cannot be expressed as sum of some consecutive numbers. There are two facts that we have to keep in mind.
- Sum of any two consecutive numbers is odd, then one of them will be odd, another one is even.
- Second fact is 2n = 2(n-1) + 2(n-1).
Example
#include <iostream>
using namespace std;
bool isSumofconsecutiveNumbers(int n) {
if((n & (n-1)) && n){
return true;
} else {
return false;
}
}
int main() {
int num = 36;
if(isSumofconsecutiveNumbers(num)){
cout << "Can be represented";
} else {
cout << "Cannot be represented";
}
}Output
Can be represented
Updated on: 27-Sep-2019
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