foo.cc: In function 'void work()':
foo.cc:20:9: warning: unused variable 'j' [-Wunused-variable]
   int i,j,k,x;
         ^
foo.cc: In function 'int main()':
foo.cc:71:8: warning: operation on 'l' may be undefined [-Wsequence-point]
      d[++l].p=d[l-1].p+1,d[l].s=d[l-1].s+k;
        ^~~
foo.cc:75:22: warning: operation on 'l' may be undefined [-Wsequence-point]
    while(d[l].s>=k)d[++l].p=d[l-1].p+1,d[l].s=d[l-1].s-k;  
                      ^~~
foo.cc:56:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    scanf("%d%d%d",&p1,&d[sum].p,&d[sum].s);
    ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
foo.cc:61:11: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
      scanf("%d%d",&d[sum].p,&d[sum].s);
      ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
foo.cc:73:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    scanf("%d",&k);
    ~~~~~^~~~~~~~~

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