increase the speed of cin and cout in c++
#include <iostream>
int main(int argc, char **argv) {
int parity = 0;
int x;
//you can use scanf , printf alternatively for speed
std::ios::sync_with_stdio(false);// this increases the speed of i/o
while (std::cin >> x)
parity ^= x;
std::cout << parity << std::endl;
return 0;
}
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