2

.vscode/settings.json

@@ -1,5 +1,21 @@
 {
     "files.associations": {
-        "iostream": "cpp"
+        "iostream": "cpp",
+        "ostream": "cpp",
+        "*.tcc": "cpp",
+        "bitset": "cpp",
+        "set": "cpp",
+        "random": "cpp",
+        "fstream": "cpp",
+        "functional": "cpp",
+        "future": "cpp",
+        "istream": "cpp",
+        "limits": "cpp",
+        "shared_mutex": "cpp",
+        "sstream": "cpp",
+        "streambuf": "cpp",
+        "regex": "cpp",
+        "tuple": "cpp",
+        "valarray": "cpp"
     }
 }

README.md

@@ -3,9 +3,36 @@ git status
 git add .
 git commit -m ""
 git push -u origin master
+
+
+---
+# `# include <bits/stdc++.h>`
 ## 高精度
 1. python打表
 2. 高精加和高精乘
+```cpp
+void pplus(int *a, int *c)
+{
+    int jw = 0;
+    for (int i = 0; i < 1000; i++)
+    {
+        c[i] += a[i] + jw;
+        jw = c[i] / 10;
+        c[i] %= 10;
+    }
+}
+void pmultiply(int *a, int c)
+{
+    int jw = 0;
+    for (int i = 0; i < 1000; i++)
+    {
+        a[i] = a[i] * c + jw;
+        jw = a[i] / 10;
+        a[i] %= 10;
+    }
+}
+```
+
 
 ## 筛法
 1. 打表
@@ -60,3 +87,103 @@ void prime(int b)
     }
 }
 ```
+## 矩阵旋转
+1. 找规律
+
+---
+## 重定向
+```cpp
+freopen(file,"r",stdin);
+freopen(file,"w",stdout);
+```
+## 随机数的产生
+1. 初始化随机数种子 `srand(time(NULL))`
+2. rand()
+
+
+## STL初步
+1. sort(开始，结束，比较函数)
+```cpp
+struct Node
+{
+    int a, b;
+};
+Node a[100];
+bool cmp(Node a, Node b)
+{
+    if (a.a != b.a)
+        return a.a > b.a;
+    return a.b > b.b;
+}
+sort(a, a + 100, cmp);
+```
+
+2. 不定长数组 vector
+```cpp
+#include <bits/stdc++.h>
+vector<int> a;
+a.size()
+a.resize()
+a.push_back()
+a.pop_back()
+a.clear()
+```
+3. 集合 set
+
+```cpp
+#define ALL(x) x.begin(), x.end()
+#define INS(x) inserter(x, x.begin())
+
+set<int> a, b;
+typedef set<int>::iterator SI;
+a.insert(1);
+a.count(1);
+for (SI i = a.begin(); i != a.end(); i++)
+    ;                                     //遍历
+set_union(ALL(a), ALL(b), INS(a));        //并集，放入a中
+set_intersection(ALL(a), ALL(b), INS(a)); //交集，放入a中
+
+```
+4. 映射 map 类似python中的字典
+```cpp
+map<string,int> dict;
+dict['r']=1;//这里dict使用的是string的方法，而dict[]使用的是int的方法
+```
+5. 栈（后进先出）,队列（先进先出）
+```cpp
+stack<int> s;
+s.top();
+s.push(1);
+s.pop();
+s.empty();
+queue<int> x;
+x.front();
+x.pop();
+x.push(1);
+x.empty();
+```
+6. 优先级队列
+
+```cpp
+struct cmp
+{
+    bool operator()(const int a, const int b)
+    {
+        return a > b;
+        //当a>b时，返回ture，也就是说越大优先级越小
+        //出队列时，先弹出小的，小的在队列top
+    }
+};
+priority_queue<int, vector<int>, cmp> a;
+a.push(1);
+a.pop();
+a.top();
+a.size();
+a.empty();
+```
+
+### 注意点
+1. vector作为参数或返回值时，尽量使用传引用，会改变传入的参数。或者直接全局变量，传都不要传。
+2. 结构体静态变量： static 变量名
+
+---

tempCodeRunnerFile.cpp

@@ -0,0 +1,134 @@
+#include <bits/stdc++.h>
+using namespace std;
+
+int main()
+{
+    int n;
+    cin >> n;
+    char start[10][11], end[10][11];
+    for (int i = 0; i < n; i++)
+        cin >> start[i];
+    for (int i = 0; i < n; i++)
+        cin >> end[i];
+    int flag = 1;
+    for (int i = 0; i < n; i++)
+        for (int j = 0; j < n; j++)
+        {
+            if (start[i][j] != end[j][n - 1 - i])
+            {
+                flag = 0;
+                break;
+            }
+        }
+    if (flag == 1)
+    {
+        cout << 1;
+        return 0;
+    }
+    flag = 1;
+    for (int i = 0; i < n; i++)
+        for (int j = 0; j < n; j++)
+        {
+            if (start[i][j] != end[n - 1 - i][n - 1 - j])
+            {
+                // cout<<i<<" "<<j<<" ";
+                // cout << start[i][j] << "!=" << end[n - 1 - j][n - 1 - i] << endl;
+                flag = 0;
+                break;
+            }
+        }
+    if (flag == 1)
+    {
+        cout << 2;
+        return 0;
+    }
+    flag = 1;
+    for (int i = 0; i < n; i++)
+        for (int j = 0; j < n; j++)
+        {
+            if (start[i][j] != end[n - 1 - j][i])
+            {
+                flag = 0;
+                break;
+            }
+        }
+    if (flag == 1)
+    {
+        cout << 3;
+        return 0;
+    }
+    flag = 1;
+    for (int i = 0; i < n; i++)
+        for (int j = 0; j < n; j++)
+        {
+            if (start[i][j] != end[n - 1 - i][j])
+            {
+                flag = 0;
+                break;
+            }
+        }
+    if (flag == 1)
+    {
+        cout << 4;
+        return 0;
+    }
+    char temp[10][11];
+    for (int i = 0; i < n; i++)
+        for (int j = 0; j < n; j++)
+        {
+            temp[n - 1 - i][j] = start[i][j];
+        }
+    /////////////////
+    int f1 = 1, f2 = 1, f3 = 1;
+    for (int i = 0; i < n; i++)
+        for (int j = 0; j < n; j++)
+        {
+            if (temp[i][j] != end[j][n - 1 - i])
+            {
+                f1 = 0;
+                break;
+            }
+        }
+    for (int i = 0; i < n; i++)
+        for (int j = 0; j < n; j++)
+        {
+            if (temp[i][j] != end[n - 1 - j][n - 1 - i])
+            {
+                f2 = 0;
+                break;
+            }
+        }
+    for (int i = 0; i < n; i++)
+        for (int j = 0; j < n; j++)
+        {
+            if (temp[i][j] != end[n - 1 - j][i])
+            {
+                f3 = 0;
+                break;
+            }
+        }
+    if (f1 || f2 || f3)
+    {
+        cout << 5;
+        return 0;
+    }
+    flag = 1;
+    for (int i = 0; i < n; i++)
+        for (int j = 0; j < n; j++)
+        {
+            if (start[i][j] != end[i][j])
+            {
+                flag = 0;
+                break;
+            }
+        }
+    if (flag == 1)
+    {
+        cout << 6;
+        return 0;
+    }
+    cout << 7;
+    ////////////////
+
+    return 0;
+}

test.cpp

@@ -0,0 +1,9 @@
+#include <bits/stdc++.h>
+using namespace std;
+
+int main()
+{
+
+
+    return 0;
+}

神奇的操作/1.cpp

@@ -0,0 +1,19 @@
+#include <bits/stdc++.h>
+using namespace std;
+
+int main()
+{
+    //都很慢
+    string line;
+    while (getline(cin, line))
+    {
+        int sum = 0, x;
+        stringstream ss(line);
+        while (ss >> x)
+        {
+            sum += x;
+        }
+        cout << sum << endl;
+    }
+    return 0;
+}

高精度/luogu_P1009.cpp

@@ -3,23 +3,49 @@ using namespace std;
 void pplus(int *a, int *c)
 {
     int jw = 0;
-    for (int i = 1; i <= 1000; i++)
+    for (int i = 0; i <= 999; i++)
     {
         c[i] += a[i] + jw;
         jw = c[i] / 10;
         c[i] %= 10;
     }
 }
-void pmultiply(int *a, int c)
+void pmultiply(int *a, int c, int *b)
 {
     int jw = 0;
-    for (int i = 0; i < 1000; i++)
+    for (int i = 0; i <= 999; i++)
     {
-        a[i] = a[i] * c + jw;
+        b[i] = a[i] * c + jw;
-        jw = a[i] / 10;
+        jw = b[i] / 10;
-        a[i] %= 10;
+        b[i] %= 10;
+        // cout << a[i];
     }
 }
+void display(int *a)
+{
+    int flag = 0;
+    for (int i = 999; i >= 0; i--)
+    {
+        while (flag == 0 && i >= 0 && a[i] == 0)
+        {
+            i--;
+        }
+        flag = 1;
+        if (i < 0)
+        {
+            cout << 0;
+            break;
+        }
+        cout << a[i];
+    }
+    cout << endl;
+}
+// void f(int sum[][1000], int n)
+// {
+//     for (int i = 1; i <= n; i++)
+//         display(sum[i]);
+//     cout << endl;
+// }
 //用高精度计算出 S = 1! + 2! + 3! + \cdots + n!S=1!+2!+3!+⋯+n!（n \le 50n≤50）
 int main()
 {
@@ -35,19 +61,24 @@ int main()
     int sum[51][1000];
     memset(sum, 0, sizeof(int) * 1000);
     sum[0][0] = 1;
+    // for (int i = 0; i < n + 1; i++)
+    // {
+    //     display(sum[i]);
+    // }
+    // cout << endl;
     for (int i = 1; i < n + 1; i++)
     {
-        pmultiply(sum[i], i);
+        pmultiply(sum[i - 1], i, sum[i]);
     }
+    // f(sum, n);
+    // cout << "start";
     for (int i = 2; i < n + 1; i++)
     {
+
+        // f(sum, n);
         pplus(sum[i - 1], sum[i]);
+        // f(sum, n);
     }
-    for (int i = 999; i >= 0; i--)
+    display(sum[n]);
-    {
-        while (sum[n][i] == 0)
-            i--;
-        cout << sum[n][i];
-    }
     return 0;
 }