How to Run Depth First Search in Linux

Dont forget to include these header files while using C in Linux:
//DFS Search:

#include<stdio.h>
#include<curses.h>
#include<stdlib.h>
#include<math.h>
#include <time.h>

DFS Search

//DFS Search:

#include<stdio.h>
#include<conio.h>
int a[20][20],reach[20],n;
void dfs(int v)
{
 int i;
 reach[v]=1;
 for(i=1;i<=n;i++)