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1114.cpp
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1114.cpp
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__________________________________________________________________________________________________
sample 40 ms submission
class Foo {
mutex m1, m2;
public:
Foo() {
m1.lock();
m2.lock();
}
void first(function<void()> printFirst) {
// printFirst() outputs "first". Do not change or remove this line.
printFirst();
m1.unlock();
}
void second(function<void()> printSecond) {
m1.lock();
// printSecond() outputs "second". Do not change or remove this line.
printSecond();
m1.unlock();
m2.unlock();
}
void third(function<void()> printThird) {
m2.lock();
// printThird() outputs "third". Do not change or remove this line.
printThird();
m2.unlock();
}
};
__________________________________________________________________________________________________
sample 48 ms submission
#include <chrono>
class Foo {
private:
int n = 0;
public:
Foo() {
}
void first(function<void()> printFirst) {
while (n != 0) std::this_thread::sleep_for(std::chrono::milliseconds(1));
printFirst(); n++;
}
void second(function<void()> printSecond) {
while (n != 1) std::this_thread::sleep_for(std::chrono::milliseconds(1));
printSecond(); n++;
}
void third(function<void()> printThird) {
while (n != 2) std::this_thread::sleep_for(std::chrono::milliseconds(1));
printThird(); n++;
}
};
__________________________________________________________________________________________________