foo.cc: In function 'bool isleap(int)':
foo.cc:6:14: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
    6 |     if(n%4==0&&n%100!=0||n%400==0) return true;
      |        ~~~~~~^~~~~~~~~~
foo.cc: In function 'int main()':
foo.cc:13:16: warning: 's' is used uninitialized [-Wuninitialized]
   13 |         d1-=d;s+=d1;
      |               ~^~~~

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