#invalid initialization of reference of type 'stdvectorint&' from expression of type 'int'

9 messages · Page 1 of 1 (latest)

surreal flareBOT
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jagged ocean
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!f

surreal flareBOT
# 

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

int countSubarraysWithSumK(vector<int>& a, int K) {
  int n = a.size();
  unordered_map<int, int> hash;
  int count = 0, sum = 0;
  for (int i = 0; i < n; i++) {
    sum += a[i];
    if (sum == K) {
      count++;
    }
    if (hash.find(sum - K) != hash.end()) {
      count += hash[sum - K];
    }
    hash[sum]++;
  }
  return count;
}

int main() {
  int n, K;
  cin >> n;
  cin >> K;
  int a[n];

  int i;
  for (i = 0; i < n; i++) {
    cin >> a[i];
  }

  cout << countSubarraysWithSumK(n, K) << endl;
  return 0;
}

Here is my code and when I am trying to compile i get this error message . Can someone help me? ( This is the only error that I get)

Amerikanos
Formatted by Zelis 🔱
jagged ocean
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The error tells you everything

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countSubarraysWithSumK's first parameter is a reference to a vector of integers, you're trying to pass a single integer

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int a[n]; is a variable length array (VLA), which is bad. You should use an std::vector for this.

steel canopy
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thank you very much!

surreal flareBOT
#

@steel canopy

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steel canopy
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!solved