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#include <string>
#include <iostream>
#include <vector>
#include <sstream>
#include <numeric>
std::vector<std::string> split( const std::string & text , char delimiter ) {
std::vector<std::string> tokens ;
std::istringstream istr { text } ;
std::string word ;
while ( std::getline( istr , word , delimiter ) ) {
tokens.push_back( word ) ;
}
return tokens ;
}
int find_subarray_sum( const std::vector<int> & numbers , int len ) {
if ( len == 1 || len == numbers.size( ) ) {
return std::accumulate( numbers.begin( ) , numbers.end( ) , 0 ) ;
}
else {
int total = 0 ;
int arraylen = numbers.size( ) ;
for ( int i = 0 ; i < arraylen - len + 1 ; i++ ) {
std::vector<int> partialarray( numbers.begin( ) + i ,
numbers.begin( ) + i + len ) ;
total += std::accumulate( partialarray.begin( ) , partialarray.end( ) ,
0 ) ;
}
return total ;
}
}
int main( ) {
std::cout << "Enter some positive integers separated by whitespace!\n" ;
std::string line ;
std::getline( std::cin , line ) ;
auto tokens { split( line , ' ' ) } ;
std::vector<int> numbers ;
for ( auto s : tokens ) {
numbers.push_back( std::stoi( s ) ) ;
}
std::vector<int> sums ;
for ( int l = 0 ; l < numbers.size( ) + 1 ; l++ ) {
if ( l % 2 == 1 ) {
sums.push_back( find_subarray_sum( numbers , l ) ) ;
}
}
std::cout << std::accumulate( sums.begin( ) , sums.end( ) , 0 ) << '\n' ;
return 0 ;
}
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