# 1116.Print Zero Even Odd

1116.Print Zero Even Odd

Suppose you are given the following code:

``````class ZeroEvenOdd {
public ZeroEvenOdd(int n) { ... }      // constructor
public void zero(printNumber) { ... }  // only output 0's
public void even(printNumber) { ... }  // only output even numbers
public void odd(printNumber) { ... }   // only output odd numbers
}``````

The same instance of ZeroEvenOdd will be passed to three different threads:

• Thread A will call zero() which should only output 0's.

• Thread B will call even() which should only ouput even numbers.

• Thread C will call odd() which should only output odd numbers. Each of the thread is given a printNumber method to output an integer. Modify the given program to output the series 010203040506... where the length of the series must be 2n.

``````Example 1:

Input: n = 2
Output: "0102"
Explanation: There are three threads being fired asynchronously. One of them calls zero(), the other calls even(), and the last one calls odd(). "0102" is the correct output.
Example 2:

Input: n = 5
Output: "0102030405"``````

``````class ZeroEvenOdd {
private:
int n;
bool flag=true;
public:
ZeroEvenOdd(int n) {
this->n = n;
}

// printNumber(x) outputs "x", where x is an integer.
void zero(function<void(int)> printNumber) {
for(int i=0;i<n;i++)
{
printNumber(0);

}

}

void even(function<void(int)> printNumber) {

for(int i=1;i<=n;i+=2){
printNumber(i);
flag=false;
}
}

void odd(function<void(int)> printNumber) {
for(int i=2;i<=n;i+=2){