add priority queue

priority_queue/data/five/answer.txt

@@ -0,0 +1 @@
+OKAY

priority_queue/data/five/code.cpp

@@ -0,0 +1,52 @@
+#include <iostream>
+#include <cstdio>
+#include <algorithm>
+#include <queue>
+#include <ctime>
+#include <cstdlib>
+
+#include "priority_queue.hpp"
+
+int rand() {
+	static int reed = 1727417277;
+	return (reed += (reed << 5) + 172741827);
+}
+
+bool testmerge()
+{
+	sjtu::priority_queue<int> pq1, pq2;
+	static int buffer[900000];
+	int pointer = 0;
+	const int MAXA = 400000;
+	const int MAXB = 400000;
+	for (int i = 1; i <= MAXA; i++) {
+		pq1.push(buffer[++pointer] = rand());
+	}
+	for (int i = 1; i <= MAXB; i++) {
+		pq2.push(buffer[++pointer] = rand());
+	}
+	pq1.merge(pq2);
+	if (!pq2.empty()) {
+		return false;
+	} else {
+		std::sort(buffer + 1, buffer + pointer + 1);
+		while (pointer > 0) {
+			if (pq1.top() != buffer[pointer]) {
+				return false;
+			}
+			pq1.pop();
+			pointer--;
+		}
+	}
+	return true;
+}
+
+int main(int argc, char *const argv[])
+{
+	if (testmerge()) {
+		std::cout << "OKAY" << std::endl;
+	} else {
+		std::cout << "FAIL" << std::endl;
+	}
+	return 0;
+}