View Compilation Error

0_0_21260728_24123.c: In function 'dfs':
0_0_21260728_24123.c:12:4: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
    for(int j=0;j<n;j++)
    ^
0_0_21260728_24123.c:12:4: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code