support bazel complie this project and format code.

learn_class/modern_cpp_30/container2/relacontainer.cpp

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+//
+// Created by light on 19-12-16.
+//
+
+#include "../container1/output_container.h"
+#include <functional>
+#include <iostream>
+#include <map>
+#include <set>
+#include <string>
+#include <tuple>
+
+using namespace std;
+
+int main() {
+  set<int> s{1, 1, 1, 2, 3, 4};
+  cout << s << endl;
+
+  multiset<int, greater<int>> ms{1, 1, 1, 2, 3, 4};
+  cout << ms << endl;
+
+  map<string, int> mp{{"one", 1}, {"two", 2}, {"three", 3}, {"four", 4}};
+
+  cout << mp << endl;
+
+  mp.insert({"four", 4});
+  cout << mp << endl;
+
+  cout << (mp.find("four") == mp.end()) << endl;
+
+  cout << (mp.find("five") == mp.end()) << endl;
+
+  mp["five"] = 5;
+
+  cout << mp << endl;
+
+  multimap<string, int> mmp{{"one", 1}, {"two", 2}, {"three", 3}, {"four", 4}};
+
+  cout << mmp << endl;
+
+  mmp.insert({"four", -4});
+
+  cout << mmp << endl;
+
+  cout << (mp.find("four")->second) << endl;
+  cout << (mp.lower_bound("four")->second) << endl;
+
+  cout << (mp.upper_bound("four")->second) << endl;
+  cout << ((--mp.upper_bound("four"))->second) << endl;
+
+  multimap<string, int>::iterator lower, upper;
+  std::tie(lower, upper) = mmp.equal_range("four");
+  cout << (lower != upper) << endl; // 检测区间非空
+
+  cout << lower->second << endl;
+  cout << (--upper)->second << endl;
+}