foo.cc: In function 'int main()':
foo.cc:14:17: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
          if(a[j]=a[i])
             ~~~~^~~~~
foo.cc:17:11: error: expected '(' before 'j'
        if j=n+1
           ^
foo.cc:5:18: warning: unused variable 'm' [-Wunused-variable]
     int a[100],n,m;              
                  ^

[Hydro](https://hydro.ac)提供评测服务