foo.cc: In function 'int main()':
foo.cc:7:21: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
  if(y%400==0||y%4==0&&y%100!=0){
               ~~~~~~^~~~~~~~~~
foo.cc:6:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&y);
  ~~~~~^~~~~~~~~

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