# cíu

unknown
c_cpp
23 days ago
2.2 kB
2
Indexable
Never
```class Solution {
public:
string dayOfTheWeek(int day, int month, int year) {
int date[60000];

//ngày 1 tháng 1 năm 1971 là thứ 2

int mon = 1, tue = 2, wed = 3, thu = 4, fri = 5, sat = 6, sun = 7;

int cnt = 6745;
while (cnt) {
date[mon] = 2; mon += 7;
date[tue] = 3; tue += 7;
date[wed] = 4; wed += 7;
date[thu] = 5; thu += 7;
date[fri] = 6; fri += 7;
date[sat] = 7; sat += 7;
date[sun] = 8; sun += 7;

cnt--;
}

int sum_of_date = 0;

for (int i = 1971; i < year; i++) {
sum_of_date += 365;

if (year % 4 == 0) {
if (year % 100 == 0) {
if (year % 400 == 0)
sum_of_date++;
}
else sum_of_date++;
}
}

for (int i = 1; i < month; i++) {
if (i == 1 || i == 3 || i == 5 || i == 7
|| i == 8 || i == 10 || i == 12)
sum_of_date += 31;
else if (i == 4 || i == 6 || i == 9 || i == 11)
sum_of_date += 30;
else if (i == 2)
sum_of_date += 28;

if (i == 2 && year % 4 == 0) {
if (year % 100 == 0) {
if (year % 400 == 0)
sum_of_date++;
}
else sum_of_date++;
}
}

sum_of_date += day;

string the_day;

if (date[sum_of_date] == 2)
the_day = "Monday";
else if (date[sum_of_date] == 3)
the_day = "Tuesday";
else if (date[sum_of_date] == 4)
the_day = "Wednesday";
else if (date[sum_of_date] == 5)
the_day = "Thursday";
else if (date[sum_of_date] == 6)
the_day = "Friday";
else if (date[sum_of_date] == 7)
the_day = "Saturday";
else if (date[sum_of_date] == 8)
the_day = "Sunday";

return the_day;
}
};```