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#include <iostream>
#include <vector>
#include <chrono>
#include <string>
#include <string_view>
#include <ranges>
#include <algorithm>
std::chrono::year_month_day stringToDate( const std::string & input ) {
std::vector<std::string> dateParts ;
char delimiter = '-' ;
auto split = input | std::views::split( delimiter ) ;
for ( const auto& subRange : split ) {
std::string datePart( &*subRange.begin() ,
std::ranges::distance( subRange ) ) ;
dateParts.push_back( datePart ) ;
}
std::chrono::year y ( std::stoi( dateParts[0] ) ) ;
std::chrono::month m (static_cast<unsigned>( std::stoi( dateParts[1] )))
;
std::chrono::day d ( static_cast<unsigned>(std::stoi( dateParts[2] ))) ;
std::chrono::year_month_day date ( y , m , d ) ;
return date ;
}
int main( ) {
std::cout << "Enter a start date in the form <year>-<month>-<day>!\n" ;
std::string start ;
std::getline( std::cin , start ) ;
std::cout << "Enter a day offset!\n" ;
std::string offsetstr ;
std::getline( std::cin , offsetstr ) ;
int offset { std::stoi( offsetstr ) } ;
std::cout << "Enter bank holidays, each day in the format above!\n" ;
std::cout << "Enter <return> to end!\n" ;
std::vector<std::string> holidays ;
std::string free ;
std::getline( std::cin , free ) ;
while ( free.length( ) > 0 ) {
holidays.push_back( free ) ;
std::getline( std::cin , free ) ;
}
std::vector<std::chrono::year_month_day> bank_holidays ;
for ( auto s : holidays ) {
bank_holidays.push_back( stringToDate( s )) ;
}
std::chrono::time_point theStart { std::chrono::sys_days {
stringToDate( start ) }} ;
while ( offset != 0 ) {
theStart += std::chrono::days{ 1 } ;
std::chrono::weekday cur_weekday{ theStart } ;
if ( cur_weekday != std::chrono::Saturday && cur_weekday !=
std::chrono::Sunday &&
std::find( bank_holidays.begin( ) , bank_holidays.end( ) ,
theStart ) == bank_holidays.end( ) ) {
offset-- ;
}
}
std::cout << theStart << '\n' ;
return 0 ;
}
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