foo.c: In function 'main':
foo.c:41:24: warning: format '%d' expects a matching 'int' argument [-Wformat=]
   41 |    if(no==1) printf("[%d],op[0]");
      |                       ~^
      |                        |
      |                        int
foo.c:9:3: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
    9 |   scanf(" %s",s);
      |   ^~~~~~~~~~~~~~

[Hydro](https://hydro.ac)提供评测服务