#include<bits/stdc++.h>

using namespace std;

int main()

{

int y,m,d,w1,w2,c;

cin>>y>>m>>d;

c=y%100;

w1=c+c/4+26*(m+1)/10+d-35;

w2=c+c/4+26*(m+1)/10+d-36;

if(y>1900&&y<2000)

cout<<w1%7<<endl;

if(y>=2000&&y<=2999)

cout<<w2%7<<endl;

return 0;

}

蔡勒公式

#include<bits/stdc++.h> using namespace std; int main() { int y,c,m,d,w1,w2; cin>>y>>m>>d; c=y%100; w1=c+c/4+26*(m+1)/10+d-35; w2=c+c/4+26*(m+1)/10+d-36; if(y>1900&&y<2000) cout<<w1%7<<endl; if(y>=2000&&y<=2999) cout<<w2%7<<endl; return 0; }

#include <stdio.h> int main() { int year,month,day; while(scanf("%d%d%d",&year,&month,&day)!=EOF){ int i,j,k; int c=year/100; int y=year-c100; int week=int(c/4)-2c+int(y+y/4)+int(13*(month+1)/5)+day-1; while(week<0){ week+=7; } week%=7; switch(week) { case 1: printf("1\n"); break; case 2: printf("2\n"); break; case 3: printf("3\n"); break; case 4: printf("4\n");break; case 5: printf("5\n"); break; case 6: printf("6\n");break; case 0: printf("0\n"); break; } } return 0; }

#include <bits/stdc++.h> using namespace std;

int main()

{ int year,y,m,d,c,w; cin>>year>>m>>d;

if(m==1||m==2)
{
	year--;
	m=m+12;
}

c=year/100;
y=year%100;

w=(y+(y/4)+(c/4)-2*c+(26*(m+1)/10)+d-1)%7;

cout<<w;


return 0;

}

#include <bits/stdc++.h> using namespace std;

int main()

{ int year,y,m,d,c,w; cin>>year>>m>>d;

if(m==1||m==2)
{
	year--;
	m=m+12;
}

c=year/100;
y=year%100;

w=(y+(y/4)+(c/4)-2*c+(26*(m+1)/10)+d-1)%7;

cout<<w;


return 0;

}

偷鸡

#include<bits/stdc++.h> using namespace std; int main(){ int y,c,m,d,w; cin>>y>>m>>d; c=y%100; w=c+c/4-(m+1)/10+d; if(y>=2000&&y<=2999) cout<<w%7; return 0; }

#include<bits/stdc++.h> using namespace std; int main() { int y,m,d,x,a,b,w; cin>>y>>m>>d; { if(m1) { x=0; } if(m2) { x=31; } if(m3) { x=59; } if(m4) { x=90; } if(m5) { x=120; } if(m6) { x=151;

	}
	if(m==7)
	{
		x=181;
	}
	if(m==8)
	{
		x=212;
	}
	if(m==9)
	{
		x=243;
	}
	if(m==10)
	{
		x=273;
	}
	if(m==11)
	{
		x=304;
	}
	if(m==12)
	{
		x=334;
	}
	if(y%4==0&&y%100!=0)
	{
		a=x+d+1;
	}
	else
	{
		a=x+d;
	}
}
w=(y-1)+((y-1)/4)-((y-1)/100)+((y-1)/400)+a;
b=w%7;
cout<<b;
return 0;

}