diff --git a/STL/STL-Deque/deque.exe b/STL/STL-Deque/deque.exe
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diff --git a/STL/STL-List/main.exe b/STL/STL-List/main.exe
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diff --git a/STL/STL-Set/multiset.cpp b/STL/STL-Set/multiset.cpp
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+++ b/STL/STL-Set/multiset.cpp
@@ -0,0 +1,41 @@
+#include <iostream>
+#include <set>//也是set
+using namespace std;
+
+class compare{
+public:
+	template <class T>
+	bool operator()(const T& a, const T& b){
+		return a > b;
+	}	
+};
+
+int main(){
+	auto cmpl = [](auto a, auto b){
+		return a < b;
+	};
+	multiset<int> a{1,1,2,3,3,3,4,5,6,7,7,7,10};
+	multiset<int, decltype(cmpl)> b(cmpl);
+	b.insert({14,16,20,18,2,2,2,4,4,6,6,8,8,10,12});
+	multiset<int, compare> c{1,3,5,7,9,11,11,11,13};
+	for(int x : a){
+		cout << x << " ";
+	}cout << endl;
+	for(int x : b){
+		cout << x << " "; 
+	}cout << endl;
+	for(int x : c){
+		cout << x << " ";
+	}cout << endl;
+	cout << b.count(2) << endl;
+	cout << *b.upper_bound(6) << " " << *b.lower_bound(6) << endl;
+	return 0;
+} 
+/*
+1 1 2 3 3 3 4 5 6 7 7 7 10
+2 2 2 4 4 6 6 8 8 10 12 14 16 18 20
+13 11 11 11 9 7 5 3 1
+3
+8 6
+*/
+//基本用法与set一致，可以有多个重复元素 
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