Day of the Week Problem & Solution

See the day of the week problem on LeetCode.

C++ Solution

#pragma GCC optimize("Ofast")

static const int _=[](){ios::sync_with_stdio(false);cin.tie(nullptr);cout.tie(nullptr);return 0;}();

class Solution {
  string dayOfTheWeek(int day, int month, int year) {
    tm tm{};
    tm.tm_year = year - 1900;
    tm.tm_mon = month - 1;
    tm.tm_mday = day;


    ostringstream oss;
    oss << put_time(&tm, "%A");

    return oss.str();

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