foo.cc: In function 'int main()':
foo.cc:18:15: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
    if(t1=='(' && t2==')' || t1=='[' && t2==']' || t1=='{' && t2=='}')
       ~~~~~~~~^~~~~~~~~~
foo.cc:18:59: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
    if(t1=='(' && t2==')' || t1=='[' && t2==']' || t1=='{' && t2=='}')
                                                   ~~~~~~~~^~~~~~~~~~
foo.cc:9:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%s",s);
  ~~~~~^~~~~~~~

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