foo.cc: In function 'int main()':
foo.cc:24:30: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
        if(minm==2&&(miny%4==0&&miny%100!=0||miny%400==0)&&mind==30)
                     ~~~~~~~~~^~~~~~~~~~~~~
foo.cc:28:31: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
        if(minm==2&&!(miny%4==0&&miny%100!=0||miny%400==0)&&mind==29)
                      ~~~~~~~~~^~~~~~~~~~~~~
foo.cc:33:10: warning: 'sum' may be used uninitialized in this function [-Wmaybe-uninitialized]
    cout<<sum<<endl;
          ^~~

自豪的采用HydroJudge(https://github.com/hydro-dev/Hydro)进行评测。