foo.cc: In function 'int main()':
foo.cc:46:22: error: expected ';' before 'if'
   46 |   if(s[i]=='L')sum*=2//sum=mul(sum,2);
      |                      ^
      |                      ;
   47 |   if(s[i]=='R')sum=sum*2+cnt//sum=add(mul(sum,2),cnt);
      |   ~~                  
foo.cc:41:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   41 |  scanf("%s",s+1);
      |  ~~~~~^~~~~~~~~~

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