foo.cc: In function 'int main()':
foo.cc:7:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    scanf("%d",&L);
    ~~~~~^~~~~~~~~
foo.cc:9:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    scanf("%d %d %d",&S,&T,&M);
    ~~~~~^~~~~~~~~~~~~~~~~~~~~
foo.cc:11:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    for(i=0;i<M;i++) scanf("%d",&a[i]);
                     ~~~~~^~~~~~~~~~~~
foo.cc:27:8: 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++;}
        ^~

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