Finished 2 of usaco

usaco/ch1/friday.cpp

@@ -0,0 +1,92 @@
+/*
+ID: philipp17
+PROG: friday
+LANG: C++                 
+*/
+/* LANG can be C++11 or C++14 for those more recent releases */
+#include <iostream>
+#include <fstream>
+#include <string>
+#include <vector>
+
+using namespace std;
+
+
+// We start on Monday, and the daylist has to start on Saturday
+vector<int> DAY_COUNTER(7, 0);
+int CURRENT_DAY = 2;
+
+bool is_leap(int year){
+    if(year % 400 == 0){
+        return true;
+    } else if(year % 100 == 0){
+        return false;
+    } else if(year % 4 == 0){
+        return true;
+    }
+    return false;
+}
+
+void monthly_routine(int days){
+    for(int day = 0; day < days; ++day){
+        if(day == 12){
+            DAY_COUNTER[CURRENT_DAY] += 1;
+            // cout << CURRENT_DAY << endl;
+        }
+
+        CURRENT_DAY = (CURRENT_DAY + 1) % 7;
+    }
+}
+
+int main() {
+    ofstream fout ("friday.out");
+    ifstream fin ("friday.in");
+
+    int n;
+    fin >> n;
+
+    for(int year = 1900; year < 1900 + n; ++year){
+        // January
+        monthly_routine(31);
+
+        // February
+        monthly_routine(is_leap(year) ? 29 : 28);
+
+        // March
+        monthly_routine(31);
+
+        // April
+        monthly_routine(30);
+
+        // May
+        monthly_routine(31);
+
+        // June
+        monthly_routine(30);
+
+        // July
+        monthly_routine(31);
+
+        // August
+        monthly_routine(31);
+
+        // September
+        monthly_routine(30);
+
+        // October
+        monthly_routine(31);
+
+        // November
+        monthly_routine(30);
+
+        // December
+        monthly_routine(31);
+    }
+
+    for(size_t i = 0; i < DAY_COUNTER.size(); ++i){
+        fout << DAY_COUNTER[i];
+        if(i != DAY_COUNTER.size() - 1) fout << " ";
+    } fout << endl;
+
+    return 0;
+}