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Java Solution for LeetCode algorithm problems, continually updating
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package g1101_1200.s1185_day_of_the_week;
// #Easy #Math #2022_03_30_Time_0_ms_(100.00%)_Space_41.7_MB_(31.89%)
public class Solution {
public String dayOfTheWeek(int day, int month, int year) {
int counter = 0;
for (int i = 1971; i < year; i++) {
if (isLeapYear(i)) {
counter += 366;
} else {
counter += 365;
}
}
for (int i = 1; i < month; i++) {
counter += dayOfMonth(i);
}
for (int i = 1; i <= day; i++) {
counter += 1;
}
if (isLeapYear(year) && month > 2) {
counter++;
}
switch (counter % 7) {
case 1:
return "Friday";
case 2:
return "Saturday";
case 3:
return "Sunday";
case 4:
return "Monday";
case 5:
return "Tuesday";
case 6:
return "Wednesday";
default:
return "Thursday";
}
}
private boolean isLeapYear(int year) {
return ((year % 4 == 0) && (year % 100 != 0)) || year % 400 == 0;
}
private int dayOfMonth(int month) {
switch (month) {
case 1:
case 3:
case 5:
case 7:
case 8:
case 10:
case 12:
return 31;
case 4:
case 6:
case 9:
case 11:
return 30;
default:
return 28;
}
}
}