#include<iostream>using namespace std;int main(){    int n;    cin>>n;    if(n%4==0&&n%100!=0||n%400==0)        cout<<"yes"<<endl;    else        cout<<"no"<<endl;    return 0;}

#include<iostream>using namespace std;int main(){    int n;    cin>>n;    if(n<101&&n>84)        cout<<"A"<<endl;    if(n<85&&n>74)           cout<<"B"<<endl;    if(n<75&&n>59)        cout<<"C"<<endl;    if(n<60)        cout<<"D"<<endl;    return 0;}

#include<iostream> using namespace std; int main() {      int n;      cin>>n;      if(n==1)          cout<<"星期一"<<endl;       if(n==2)          cout<<"星期二"<<endl;       if(n==3)          cout<<"星期三"<<endl;       if(n==4)          cout<<"星期四"<<endl;       if(n==5)          cout<<"星期五"<<endl;       if(n==6)          cout<<"星期六"<<endl;       if(n==7)          cout<<"星期日"<<endl;       if(n!=1&&n!=2&&n!=3&&n!=4&&n!=5&&n!=6&&n!=7)          cout<<"输入有误"<<endl;     return 0; } 

#include<iostream>using namespace std;int main(){    int n;    cin>>n;    if(n<=3)cout<<"10";    if(n>3&&n<=15)cout<<(n-3)*2+10;    if(n>15)cout<<(n-15)*2.4+34;    return 0;    } 

#include<iostream>using namespace std;int main(){    double n,a;    cin>> n;    if(n<=100)cout<<n<<endl;    if(n>100&&n<=300)cout<<9*n/10<<endl;    a=(n-300)*8/10;    if(n>300)cout<<300*9/10+a<<endl;    return 0;}

#include<iostream>using namespace std;int main(){    double n;    cin>> n;    if(n<300)cout<<n<<endl;    if(n>=300&&n<500)cout<<n*9/10<<endl;    if(n>=500&&n<1000)cout<<8*n/10<<endl;    if(n>=1000)cout<<n-300<<endl;    return 0;}

#include<iostream>#include<cmath>using namespace std;int main(){    double a,b,c,m,x1,x2;    cin>>a>>b>>c;    m=b*b-4*a*c;    if(m>0)    {       x1=(-b-sqrt(m))/(2*a);       x2=(-b+sqrt(m))/(2*a);       cout<<x1<<" "<<x2;    }    else    {       if(m<0)cout<<"No";       else cout<<-b/(2*a);    }    return 0;}

#include <cstdlib>  #include <iostream> using namespace std; int main(int argc, char *argv[]) {     long int y,m,d,a; char x;      cin>>y>>x>>m>>x>>d;      if(y%4==0&&y%100!=0||y%400==0) a=29;      else a=28;     if(m>1) d=d+31;      if(m>2) d=d+a;      if(m>3) d=d+31;      if(m>4) d=d+30;     if(m>5) d=d+31;      if(m>6) d=d+30;      if(m>7) d=d+31;      if(m>8) d=d+31;      if(m>9) d=d+30;      if(m>10) d=d+31;      if(m>11) d=d+30;      cout<<d<<endl; //system("PAUSE");      return EXIT_SUCCESS;  } 

#include<iostream>using namespace std;int main(){    int a1,a2,a3,a4,a5,max,min,ans;    cin>>a1>>a2>>a3>>a4>>a5;    if(a1>a2) max=a1;    else max=a2;    if(a3>max) max=a3;    if(a4>max) max=a4;    if(a5>max) max=a5;     if(a1<a2) min=a1;    else min=a2;    if(a3<min) min=a3;    if(a4<min) min=a4;    if(a5<min) min=a5;    ans=min*max;    cout<<ans; }

#include<iostream>using namespace std;int main(){    int a,b,c,e;    char d;    cin>>a>>d>>b>>d>>c;    e=3600*a+60*b+c;    cout<<e<<endl;    cin>>e;     a=e/3600;     e=e%3600;    b=e/60;    e=e%60;    c=e;    if(a<10)cout<<"0";    cout<<a<<d;    if(b<10)cout<<"0";    cout<<b<<d;    if(c<10)cout<<"0";    cout<<c;}