CPP

minimum no of jump required to reach end of arry


 int minJumps(int a[], int n){
       
        if(n<=1) return 0;
        if (n==0) return -1;
        if(a[0]==0) return -1;
       
        int jump=1;  int maxReach=a[0];  int step= a[0];
        for(int i=1; i<n; i++){
      
        if(i==n-1) return jump;
        
        maxReach= max(maxReach,i+a[i]);
        step--;
        if(step==0){
         jump++;
         if (i >= maxReach)
				return -1;
         step= maxReach-i;   
        } }
        return -1;
    }