foo.cc: In function 'void solve(int, int)':
foo.cc:30:14: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
     int mid=l+r>>1,k1=l-1,k2=mid,kk;
             ~^~
foo.cc: In function 'int main()':
foo.cc:55:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %lf",&n,&f[0]);
     ~~~~~^~~~~~~~~~~~~~~~~~~
foo.cc:57:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%lf %lf %lf",&s[i].a,&s[i].b,&s[i].r);
         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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