View Compilation Error

0_0_28717994_10396.c:3:1: error: unknown type name 'using'
 using namespace std;
 ^
0_0_28717994_10396.c:3:17: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'std'
 using namespace std;
                 ^
0_0_28717994_10396.c: In function 'main':
0_0_28717994_10396.c:16:3: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
   for(long i=0;i<n;i++)
   ^
0_0_28717994_10396.c:16:3: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
0_0_28717994_10396.c:23:3: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
   for(long j=0;j<=max1;j++)
   ^