day7

2023-08-02 19:22:52 +08:00
parent 15ae1803d7
commit 994963d919
2 changed files with 57 additions and 0 deletions
@@ -0,0 +1,51 @@
+// vector 的嵌套使用示例
+#include <bits/stdc++.h>
+
+using namespace std;
+
+int main()
+{
+    vector<vector<int> > vs; // 嵌套容器
+    vector<int> v1, v2, v3;
+
+    for (int i = 0; i < 9; i++)
+    {
+        switch (i / 3)
+        {
+        case 0:
+            v1.push_back(i + 1);
+            break;
+        case 1:
+            v2.push_back(i + 1);
+            break;
+        case 2:
+            v3.push_back(i + 1);
+            break;
+        }
+    }
+
+    vs.push_back(v1);
+    vs.push_back(v2);
+    vs.push_back(v3);
+    // for (int i = 0; i < vs.size(); i++)
+    // {
+    //     for (int j = 0; j < vs[i].size(); j++)
+    //     {
+    //         cout << vs[i][j] << " ";
+    //     }
+    //     cout << endl;
+    // }
+
+    vector<vector<int> >::iterator it;
+    for (it = vs.begin(); it != vs.end(); it++)
+    {
+        vector<int>::iterator it2;
+        for (it2 = (*it).begin(); it2 != (*it).end(); it2++)
+        {
+            cout << *it2 << " ";
+        }
+        cout << endl;
+    }
+
+    return 0;
+}