foo.cc:3:17: warning: suggest parentheses around '+' inside '<<' [-Wparentheses]
 char totem[1<<10+1][1<<11+1];
               ~~^~
foo.cc:3:26: warning: suggest parentheses around '+' inside '<<' [-Wparentheses]
 char totem[1<<10+1][1<<11+1];
                        ~~^~
foo.cc: In function 'int main()':
foo.cc:6:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&n);
  ~~~~~^~~~~~~~~

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