tl;dr
Challenge suggests that it's some kind of music. I compiled the code (removed warnings from listning for clarity):
```
~ $ cat putcharmusic.c
main(t,i,j){unsigned char p[]="###<f_YM\204g_YM\204g_Y_H #<f_YM\204g_YM\204g_Y_H #+-?[WKAMYJ/7 #+-?[WKgH #+-?[WKAMYJ/7hk\206\203tk\\YJAfkkk";for(i=0;t=1;i=(i+1)%(sizeof(p)-1)){double x=pow(1.05946309435931,p[i]/6+13);for(j=1+p[i]%6;t++%(8192/j);)putchar(t>>5|(int)(t*x));}}
~ $ cc putcharmusic.c -o putcharmusic
/tmp/ccaifl5q.o: In function `main':
putcharmusic.c:(.text+0x19e): undefined reference to `pow'
collect2: error: ld returned 1 exit status
~ $ cc -lm putcharmusic.c -o putcharmusic
~ $ ./putcharmusic | aplay
Playing raw data 'stdin' : Unsigned 8 bit, Rate 8000 Hz, Mono
^CAborted by signal Interrupt...
aplay: pcm_write:2051: write error: Interrupted system call
```
I can clearly hear [Star Wars theme song](https://www.youtube.com/watch?v=_D0ZQPqeJkk).
Flag is `SECCON{STAR_WARS}`.

Btw. I fail to understand how a challenge could be easier.