foo.c: In function 'main':
foo.c:9:27: warning: iteration 9 invokes undefined behavior [-Waggressive-loop-optimizations]
    9 |                 if(l+30>=a[i]) s++;
      |                          ~^~~
foo.c:8:18: note: within this loop
    8 |         for(i=1;i<=10;i++){
      |                 ~^~~~

[Hydro](https://hydro.ac)提供评测服务