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how to initialize an array to value 0 or -1 Code Example
Initialize all the elements of array to 0 
int myArray[10] = { 0 }; // all elements 0
Source: stackoverflow.com
how to initialize an array to value 0 or -1 
int arr[10001];
memset(arr,-1,sizeof(arr));

int arr[m][n];
memset(arr,-1,sizeof(arr));


//NOTE:- memset can intialize the array or vector with value -1 or 0 only.



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Horje