foo.c: In function 'main':
foo.c:11:5: warning: implicit declaration of function 'sqrt' [-Wimplicit-function-declaration]
   11 |   m=sqrt(j)+1;
      |     ^~~~
foo.c:11:5: warning: incompatible implicit declaration of built-in function 'sqrt'
foo.c:2:1: note: include '<math.h>' or provide a declaration of 'sqrt'
    1 | #include <stdio.h>
  +++ |+#include <math.h>
    2 | 
foo.c:7:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
    7 |  scanf("%d",&i);
      |  ^~~~~~~~~~~~~~

[Hydro](https://hydro.ac)提供评测服务