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#include <iostream>
#include <string>
#include <vector>
std::vector<std::string> split( const std::string & startline ,
const std::string & sep ) {
std::vector<std::string> separated ;
std::string::size_type start { 0 } ;
std::string::size_type pos ;
do {
pos = startline.find_first_of( sep , start ) ;
separated.push_back( startline.substr(start , pos - start )) ;
start = pos + 1 ;
} while ( pos != std::string::npos ) ;
return separated ;
}
void print( const std::vector<int> & numbers ) {
std::cout << " ( " ;
for ( int i : numbers ) {
std::cout << i << " " ;
}
std::cout << ")\n" ;
}
int main( ) {
std::cout << "Enter a matrix by inputting an equal number of integers per line!\n" ;
std::cout << "Enter <return> to end!\n" ;
std::vector<std::vector<int>> matrix ;
std::string line ;
std::getline( std::cin , line ) ;
while ( line.length( ) > 0 ) {
std::vector<std::string> linenumbers ( split( line , " " ) ) ;
std::vector<int> numbers ;
for ( auto s : linenumbers )
numbers.push_back( std::stoi( s ) ) ;
matrix.push_back( numbers ) ;
std::getline( std::cin , line ) ;
}
int matrixlen = matrix.size( ) ;
int rowlen = matrix[0].size( ) ;
std::vector<std::vector<int>> result ;
for ( int r = 0 ; r < matrixlen - 1 ; r++ ) {
std::vector<int> resultline ;
for ( int col = 0 ; col < rowlen - 1 ; col++ ) {
int sum = matrix[ r ][col] + matrix[r][ col + 1 ] +
matrix[ r + 1][ col ] + matrix[ r + 1 ][ col + 1 ] ;
resultline.push_back( sum ) ;
}
result.push_back( resultline ) ;
}
std::cout << "(\n" ;
for ( const auto & numline : result ) {
print( numline ) ;
}
std::cout << ")\n" ;
return 0 ;
}
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