foo.c: In function 'main':
foo.c:7:4: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
    scanf("%d",&L);
    ^~~~~~~~~~~~~~
foo.c:9:4: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
    scanf("%d %d %d",&S,&T,&M);
    ^~~~~~~~~~~~~~~~~~~~~~~~~~
foo.c:11:21: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
    for(i=0;i<M;i++) scanf("%d",&a[i]);
                     ^~~~~~~~~~~~~~~~~
foo.c:27:10: warning: 'p1' may be used uninitialized in this function [-Wmaybe-uninitialized]
        if(p1==0) {w=a[e-1];b=e;r=w+T;l=w+S;num++;}
          ^

[Hydro](https://hydro.ac)提供评测服务