What should I pass, so that the function recognizes it?-CodePudding

This is an easy category question on leetcode. The solution works fine on their compiler, but I just wanted to learn that while coding the same thing on my compiler, What should I pass in the main function so that the vector function gets it?

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

class Solution {
public:
    vector<int> runningSum(vector<int>& nums)
    {
        int n=nums.size();
       int sum=0;
       vector<int>arr;
       for(int i=0; i<n; i  ){
        sum = sum   nums[i];
        arr.push_back(sum);
       }
    }
    return arr;
};

int main(){
    int size;
    cin>>size;
    int nums[size];
    int i;
    for(i=0; i<size; i  )
        cin>>nums[i];
    
    Solution ob;
    cout<<ob.runningSum(???);
}

CodePudding user response：

Like the code says you need a vector

int main(){
    int size;
    cin>>size;
    vector<int> nums;
    int i;
    for(i=0; i<size; i  )
    {
        int x;
        cin>>x;
        nums.push_back(x);
    }
    
    Solution ob;
    cout<<ob.runningSum(nums);
}

CodePudding user response：

int nums[size]; with non-const variable size is called Variable-Length Array (VLA). This is not in the C standard.

Since the function accepts vector, you should use std::vector.

int main(){
    int size;
    cin>>size;
    //int nums[size];
    std::vector<int> nums(size); // allocate a vector with size elements
    int i;
    for(i=0; i<size; i  )
        cin>>nums[i];
    
    Solution ob;
    //cout<<ob.runningSum(???);
    cout<<ob.runningSum(nums); // and pass the vector
}