~2 CCF 2022-03-1 uninitialized warning

Title Description

Input

Output

The sample input

10 7
1 2
3 3
3 0
3 3
6 2
2 1
8 2

Sample output

3

Source code

#include <iostream>
#include <vector>

using namespace std;


int main() {
    
    int n , k ;
    cin >> n >> k;
    int res=0;
    int temp1=0;
    int temp2=0;
    double *arr=new double [n];
    for (int i = 0; i <n ; i++) {
    
        arr[i]= 0;
    }
    arr[0]= 1;
    for (int i = 0; i < k; i++) {
    
        cin>>temp1>>temp2;
        if (!arr[temp2]){
    
            res++;
            arr[temp1]= 1;
        } else{
    
            arr[temp1]= 1;
        }
    }
    cout<<res<<endl;
    delete []arr;



    return 0;
}

The subtasks

About this problem

use bool Array Some data fail , So replace it in the back double It's shaped