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#include <iostream>
#include <vector>
/*
*
* 3.20
*
*
*/
using std::string;
using std::cout;
using std::cin;
using std::cerr;
using std::clog;
using std::endl;
using std::vector;
int main () {
vector<int> VecNumbers;
int Numbers = 0;
while(cin >> Numbers) {
VecNumbers.push_back(Numbers);
}
for(decltype(VecNumbers.size()) Index = 0 ; Index < VecNumbers.size()-1 ; Index += 2) { // VecNumbers.size() -1 in case the input
cout << VecNumbers[Index] + VecNumbers[Index + 1] << " "; // numbers are odd. It doesnt calculate anything
} // if it's odd
cout << endl;
auto MaxSize = VecNumbers.size()-1;
decltype(VecNumbers.size()) Index = 0;
while(Index <= MaxSize) {
if (Index == MaxSize) {
cout << VecNumbers[Index] + VecNumbers[MaxSize] << " ";
break;
}
cout << VecNumbers[Index] + VecNumbers[MaxSize] << " ";
--MaxSize;
++Index;
}
cout << endl;
return 0;
}
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