Go: package main

import "fmt"

func main() {
	days := [12]int{31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}
	weekday := [7]string{"Wednesday", "Thursday", "Friday", "Saturday", "Sunday", "Monday", "Tuesday"}

	for {
		var m, d int
		fmt.Scan(&m, &d)
		if m == 0 {
			break
		}

		for i := 0; i < m-1; i++ {
			d += days[i]
		}

		fmt.Println(weekday[d%7])
	}
}

C++: #include <iostream>
#include <string>
#include <map>
#include <utility>
using namespace std;
map<pair<int,int>,string> mp;
string s[7]={"Monday","Tuesday","Wednesday","Thursday","Friday","Saturday","Sunday"};
int main(){
	int cnt=3;
	for(int i=1;i<=12;i++){
		int days;
		if(i==2)	days=29;
		else if(i&1) 	days=(i<=7?31:30);
		else 		days=(i<=7?30:31);
		for(int j=1;j<=days;j++){
			mp[make_pair(i,j)]=s[cnt++];
			cnt%=7;
		}
	}
	int m,d;
	while(true){
		cin>>m>>d;
		if(m==0)	return 0;
		cout<<mp[make_pair(m,d)]<<endl;
	}
	return 0;
}

C++: #include<iostream>
#include<string>
using namespace std;
int x[13][32], y[13] = { 0,31,29,31,30,31,30,31,31,30,31,30,31 }, sum, n, m; string T[7] = { "Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday" };
int main() {
	for (int i = 1; i <= 12; i++) {
		for (int j = 1; j <= y[i]; j++) {
			x[i][j] = sum % 7;
			sum++;
		}
	}
	while (true) {
		cin >> n >> m; if (!n) { break; }
		cout << T[x[n][m]] << endl;
	}
}

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

#define REP(i, s, n) for (int i = s; i < n; ++i)
#define rep(i, n) REP(i, 0, n)
#define SORT(c) sort((c).begin(), (c).end())
#define IINF INT_MAX
#define LLINF LLONG_MAX
#define DEBUG false

//Zeller's conguence

int main()
{
    int h, y, m, d;
    h = 20;
    y = 4;
    cin >> m >> d;
    if (m == 1 || m == 2)
    {
        m += 12;
        y--;
    }
    int r = 5 * h + h / 4;
    int w = {d + ((13 * (m + 1)) / 5) +
             y + y / 4 + r + 5};

    int ans = w % 7 + 1;
    cout << w << " " << ans << endl;
    switch (ans)
    {
    case 7:
        cout << "Sunday" << endl;
        break;
    case 1:
        cout << "Monday" << endl;
        break;
    case 2:
        cout << "Tuesday" << endl;
        break;
    case 3:
        cout << "Wednesday" << endl;
        break;
    case 4:
        cout << "Thursday" << endl;
        break;
    case 5:
        cout << "Friday" << endl;
        break;
    case 6:
        cout << "Saturday" << endl;
        break;
    }
    return 0;
}

C++: //1=31,2=29,3=31,4=30,5=31,6=30,7=31,8=31,9=30,10=31,11=30,12=31//
#include <iostream>
#include<string>
using namespace std;
int main(){
    string str[7]{"Wednesday","Thursday","Friday","Saturday","Sunday","Monday","Tuseday"};
    int t[11]{31,60,91,121,152,182,213,244,274,305,335};
    //        0   1  2  3   4   5   6  7    8   9   10//
    int d,m;
    while(cin>>m>>d){
        if(m==0)break;
        if(m==1)cout<<str[d%7]<<endl;
        else{
            d=d+t[m-2];
            cout<<str[d%7]<<endl;
        }
    
    }
    return 0;
}

C++: #include<iostream>
using namespace std;

int main(){
	int month[]={31,29,31,30,31,30,31,31,30,31,30,31};
	int sum[13];
	char *week[]={"Thursday","Friday","Saturday","Sunday","Monday","Tuesday","Wednesday"};
	int m,d;
	sum[0]=0;
	for(int i=1;i<=12;i++)sum[i] = sum[i-1]+month[i-1];
	while(cin>>m>>d,m||d)cout<<week[(sum[m-1]+d-1)%7]<<endl;
	return 0;
}

C++: #include <iostream>
	#include <cstdio>
	#include <cstdlib>
	#include <time.h>
	#include <math.h>
	#include <vector>
	#include <queue>
	#include <map>
	#include <set>
	#include <algorithm>
	#include <iterator>
	#include <sstream>
	#include <string>
	#include <bitset>
	using namespace std;
	#define FOR(I,F,N) for(int I = F; I < (int)(N); I++)
	#define rep(i, n) FOR(i, 0, n)
	#define FIN(V) cout<<V<<endl
	#define pb push_back
	#define INF (1 << 30)
	typedef pair<int, int> P;
	typedef long long ll;
	typedef priority_queue<int> pq;
	int StrToInt(string);
	string IntToStr(int);
	int dx[4] = {1, -1, 0, 0};
	int dy[4] = {0, 0, 1, -1};
	
	int main(void){
		int month[] = {31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
		int n, m;
		while(cin >> n >> m, n || m){
			int day = 0;
			rep(i, n-1)day += month[i];
			day += m;
			int yo = day % 7;
			if(yo == 1){
				FIN("Thursday");
			}else if(yo == 2){
				FIN("Friday");
			}else if(yo == 3){
				FIN("Saturday");
			}else if(yo == 4){
				FIN("Sunday");
			}else if(yo == 5){
				FIN("Monday");
			}else if(yo == 6){
				FIN("Tuesday");
			}else if(yo == 0){
				FIN("Wednesday");
			}
		}


		return 0;
	}
	
	
	
	int StrToInt(string s){
		stringstream ss;
		ss << s;
		int val;
		ss >> val;
		return val;
	}
	string IntToStr(int i){
		stringstream ss;
		ss << i;
		return ss.str();
	}

C++: #include <iostream>
using namespace std;

int main() {
  int days[12] = {31,29,31,30,31,30,31,31,30,31,30,31};
  string youbi[7] = {"Monsay","Tuesday","Wednesday","Thursday",
		     "Friday","Saturday","Sunday"};
  while(1) {
    int mon, day;
    cin >> mon >> day;
    if(mon == 0) break;

    int sum = 0;
    for(int i = 0; i < mon-1; i++) {
      sum += days[i];
    }
    sum += day;

    cout << youbi[sum%7+2] << endl;
  }
  return 0;
}

C++: #include<stdio.h>
int main()
{
	int m,d,dl[11]={31,29,31,30,31,30,31,31,30,31,30};
	int y=2;
	char yb[][10]={
		"Monday","Tuesday","Wednesday","Thursday","Friday","Saturday","Sunday"
	};
	while(1){
		y=2;
		scanf("%d%d",&m,&d);
		if(m==0){
			break;
		}
		if(m!=1){
			for(int i=2;i<=m;i++){
				y+=dl[i-2];
			}
		}
		y+=d;
		printf("%s\n",yb[y%7]);
	}
	return 0;
}

C++: #include<iostream>
using namespace std;

int main(){
	char *dotw[7] = {"Monday","Tuesday","Wednesday","Thursday","Friday","Saturday","Sunday"};
	int mod[12] = {31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
	int i, day, mon, dcnt;
	while(true){
		dcnt = 0;
		cin>>mon>>day;
		if(mon==0)
			break;
		for(i=1;i<mon;i++){
			dcnt += mod[i-1];
		}
		dcnt += day + 2;
		cout << dotw[dcnt%7] << endl;
	}
	return 0;
}

C++: #include <string>
#include <vector>
#include <algorithm>
#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <cmath>
#include <queue>
#include <map>
#define INF 100000000
#define rep(i,a) for(int i=0;i<(a);i++)

using namespace std;
typedef long long ll;

int main(){
    int hosei[]={0,4,0,1,4,6,2,4,0,3,5,1,3};
    string day[]={"Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday"};
    int m,n;
    while(1){
        cin>>m>>n;
        if(!(m||n))break;
        cout<<day[(hosei[m]+n%7-1)%7]<<endl;
    }
    
    
    return 0;
}

C++: #include <stdio.h>
#include<math.h>
using namespace std;

int Zeller(int month,int day){
	int year = 2004;
	if(month == 1 || month==2){
		year--;
		month += 12;
	}
	return (year + year/4 - year/100 + year/400 + (13*month+8)/5 + day)%7;
}

int main(){

	int month,day;
	while(true){
		scanf("%d %d",&month,&day);
		if(month == 0)break;

		switch(Zeller(month,day)){
		case 0:
			printf("Sunday\n");
			break;
		case 1:
			printf("Monday\n");
			break;
		case 2:
			printf("Tuesday\n");
			break;
		case 3:
			printf("Wednesday\n");
			break;
		case 4:
			printf("Thursday\n");
			break;
		case 5:
			printf("Friday\n");
			break;
		case 6:
			printf("Saturday\n");
			break;
		}

	}

    return 0;
}