add14

14/.vim_localrc

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+nmap <silent> <F5> <F7>

14/01.cpp

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+#include <vector>
+#include <set>
+#include "printer.h"
+
+using namespace std;
+
+int main() {
+    vector<int> a = {9, 8, 5, 2, 1, 1};
+    cout << "vector=" << a << endl;
+    set<int> b = {9, 8, 5, 2, 1, 1};
+    cout << "set=" << b << endl;
+    return 0;
+}

14/02.cpp

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+#include <vector>
+#include <set>
+#include "printer.h"
+
+using namespace std;
+
+int main() {
+    vector<int> a = {1, 2, 3, 4, 5, 6, 7};
+    vector<int>::iterator a_it = a.begin();
+    cout << "vector[0]=" << *a_it << endl;
+
+    set<int> b = {1, 2, 3, 4, 5, 6, 7};
+    set<int>::iterator b_it = b.begin();
+    cout << "set[0]=" << *b_it << endl;
+
+    return 0;
+}

14/printer.h

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+#pragma once
+
+#include <iostream>
+#include <utility>
+
+namespace std {
+
+template <class T,
+         class = decltype(std::declval<ostream &>() <<
+                          *++std::declval<T>().begin()),
+         class = decltype(std::declval<T>().begin() !=
+                          std::declval<T>().end())>
+ostream &operator<<(ostream &os, T const &v) {
+    os << '{';
+    auto it = v.begin();
+    if (it != v.end()) {
+        os << *it;
+        for (++it; it != v.end(); ++it) {
+            os << ',' << *it;
+        }
+    }
+    os << '}';
+    return os;
+}
+
+}