foo.cc: In function 'int main()':
foo.cc:6:15: error: expected ';' before 'if'
    6 |         cin>>y
      |               ^
      |               ;
    7 |         if(y%4==0||y%100!=0&&y%400==0)
      |         ~~     
foo.cc:9:9: error: 'else' without a previous 'if'
    9 |         else
      |         ^~~~

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