diff --git a/4077_net/Readme.md b/4077_net/Readme.md
new file mode 100644
index 0000000..b4f8d75
--- /dev/null
+++ b/4077_net/Readme.md
@@ -0,0 +1,3 @@
+# 标题
+
+* 内容
\ No newline at end of file
diff --git a/4077_net/doc/Readme.md b/4077_net/doc/Readme.md
new file mode 100644
index 0000000..b4f8d75
--- /dev/null
+++ b/4077_net/doc/Readme.md
@@ -0,0 +1,3 @@
+# 标题
+
+* 内容
\ No newline at end of file
diff --git a/4077_net/doc/绀惧尯缃戠粶.pdf b/4077_net/doc/绀惧尯缃戠粶.pdf
new file mode 100644
index 0000000..1983c8d
Binary files /dev/null and b/4077_net/doc/绀惧尯缃戠粶.pdf differ
diff --git a/4077_net/main.cpp b/4077_net/main.cpp
new file mode 100644
index 0000000..f39ad54
--- /dev/null
+++ b/4077_net/main.cpp
@@ -0,0 +1,6 @@
+#include <iostream>
+
+int main()
+{
+    std::cout << "Hello Easy C++ project!" << std::endl;
+}
diff --git a/4077_net/main.exe b/4077_net/main.exe
new file mode 100644
index 0000000..fc4df42
Binary files /dev/null and b/4077_net/main.exe differ
diff --git a/4077_net/net.cpp b/4077_net/net.cpp
new file mode 100644
index 0000000..b96662c
--- /dev/null
+++ b/4077_net/net.cpp
@@ -0,0 +1,84 @@
+#include <iostream>
+using namespace std;
+int n, now = 0, m, e[100001][2] = { 0 }, g[100001] = { 0 }, p[100001][4] = { 0 };
+int mins(int a, int b)
+{
+    return a < b ? a : b;
+}
+int maxs(int a, int b)
+{
+    return a > b ? a : b;
+}
+void party(int a, int b)
+{
+   // cout << a << " " << b << ":";
+    if (g[a] == 0 && g[b] == 0) {
+        g[a] = ++now;
+        g[b] = now;
+        int a0 = e[a][0], b0 = e[b][0], a1 = e[a][1], b1 = e[b][1];
+        p[now][0] = mins(a0, b0);
+        p[now][1] = mins(a1, b1);
+        p[now][2] = maxs(a0, b0);
+        p[now][3] = maxs(a1, b1);
+    } else {
+        while (p[g[a]][0] == -1) {
+            a = p[g[a]][3];
+        }
+        while (p[g[b]][0] == -1) {
+            b = p[g[b]][3];
+        }
+        if (g[a] > g[b]) {
+            int o = a;
+            a = b;
+            b = o;
+        }
+        /*cout << g[a] << "?";
+        cout << g[b] << "?" << endl;*/
+        if (g[a] == 0) {
+            g[a] = g[b];
+            int a0 = e[a][0], a1 = e[a][1];
+            p[g[b]][0] = mins(a0, p[g[b]][0]);
+            p[g[b]][1] = mins(a1, p[g[b]][1]);
+            p[g[b]][2] = maxs(a0, p[g[b]][2]);
+            p[g[b]][3] = maxs(a1, p[g[b]][3]);
+        } else {
+            if (g[a] != g[b]) {
+                p[g[b]][0] = mins(p[g[a]][0], p[g[b]][0]);
+                p[g[b]][1] = mins(p[g[a]][1], p[g[b]][1]);
+                p[g[b]][2] = maxs(p[g[a]][2], p[g[b]][2]);
+                p[g[b]][3] = maxs(p[g[a]][3], p[g[b]][3]);
+                p[g[a]][0] = -1, p[g[a]][3] = b;
+            }
+        }
+    }/*
+    for (int i = 0; i <= 3; i++) {
+        cout << p[g[a]][i] << " ";
+    }
+    cout << endl;
+    for (int i = 0; i <= 3; i++) {
+        cout << p[g[b]][i] << " ";
+    }
+    cout << endl;*/
+}
+int main()
+{
+    cin >> n >> m;
+    for (int i = 1; i <= n; i++) {
+        cin >> e[i][0] >> e[i][1];
+    }
+    for (int i = 1; i <= m; i++) {
+        int yi, er;
+        cin >> yi >> er;
+        //cout << i << "||";
+        party(yi, er);
+    }
+    int ans = 400000000;
+    for (int i = 1; i <= now; i++) {
+        if (p[i][0] != -1) {
+            int zhou = p[i][2] - p[i][0] + p[i][3] - p[i][1];
+            ans = mins(zhou * 2, ans);
+        }
+    }
+    cout << ans;
+    max()
+}
\ No newline at end of file
diff --git a/4077_net/net.exe b/4077_net/net.exe
new file mode 100644
index 0000000..6da36d0
Binary files /dev/null and b/4077_net/net.exe differ
diff --git a/4077_net/net2.cpp b/4077_net/net2.cpp
new file mode 100644
index 0000000..f9e67f0
--- /dev/null
+++ b/4077_net/net2.cpp
@@ -0,0 +1,83 @@
+#include <iostream>
+using namespace std;
+int n, now = 0, m, e[100001][2] = { 0 }, g[100001] = { 0 }, p[100001][4] = { 0 };
+int mins(int a, int b)
+{
+    return a < b ? a : b;
+}
+int maxs(int a, int b)
+{
+    return a > b ? a : b;
+}
+void party(int a, int b)
+{
+    //cout << a << " " << b << ":";
+    if (g[a] == 0 && g[b] == 0) {
+        g[a] = ++now;
+        g[b] = now;
+        int a0 = e[a][0], b0 = e[b][0], a1 = e[a][1], b1 = e[b][1];
+        p[now][0] = mins(a0, b0);
+        p[now][1] = mins(a1, b1);
+        p[now][2] = maxs(a0, b0);
+        p[now][3] = maxs(a1, b1);
+    } else {
+        while (p[g[a]][0] == -1) {
+            a = p[g[a]][3];
+        }
+        while (p[g[b]][0] == -1) {
+            b = p[g[b]][3];
+        }
+        if (g[a] > g[b]) {
+            int o = a;
+            a = b;
+            b = o;
+        }
+        //cout << g[a] << "?";
+        //cout << g[b] << "?" << endl;
+        if (g[a] == 0) {
+            g[a] = g[b];
+            int a0 = e[a][0], a1 = e[a][1];
+            p[g[b]][0] = mins(a0, p[g[b]][0]);
+            p[g[b]][1] = mins(a1, p[g[b]][1]);
+            p[g[b]][2] = maxs(a0, p[g[b]][2]);
+            p[g[b]][3] = maxs(a1, p[g[b]][3]);
+        } else {
+            if (g[a] != g[b]) {
+                p[g[b]][0] = mins(p[g[a]][0], p[g[b]][0]);
+                p[g[b]][1] = mins(p[g[a]][1], p[g[b]][1]);
+                p[g[b]][2] = maxs(p[g[b]][2], p[g[b]][2]);
+                p[g[b]][3] = maxs(p[g[b]][3], p[g[b]][3]);
+                p[g[a]][0] = -1, p[g[a]][3] = b;
+            }
+        }
+    }/*
+    for (int i = 0; i <= 3; i++) {
+        cout << p[g[a]][i] << " ";
+    }
+    cout << endl;
+    for (int i = 0; i <= 3; i++) {
+        cout << p[g[b]][i] << " ";
+    }
+    cout << endl;*/
+}
+int main()
+{
+    cin >> n;
+    for (int i = 1; i <= n; i++) {
+        cin >> e[i][0] >> e[i][1];
+    }
+    for (int i = 1; i <= m; i++) {
+        int yi, er;
+        cin >> yi >> er;
+        //cout << i << "||";
+        party(yi, er);
+    }
+    int ans = 400000000;
+    for (int i = 1; i <= now; i++) {
+        if (p[i][0] != -1) {
+            int zhou = p[i][2] - p[i][0] + p[i][3] - p[i][1];
+            ans = mins(zhou * 2, ans);
+        }
+    }
+    cout << ans;
+}
\ No newline at end of file
diff --git a/4077_net/test/In1 (15).txt b/4077_net/test/In1 (15).txt
new file mode 100644
index 0000000..7e0029f
--- /dev/null
+++ b/4077_net/test/In1 (15).txt	
@@ -0,0 +1,1101 @@
+100 1000
+56297539 36140795
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diff --git a/4077_net/test/In2 (7).txt b/4077_net/test/In2 (7).txt
new file mode 100644
index 0000000..6ecfe42
--- /dev/null
+++ b/4077_net/test/In2 (7).txt	
@@ -0,0 +1,151 @@
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diff --git a/4077_net/test/in.txt b/4077_net/test/in.txt
new file mode 100644
index 0000000..91cb76a
--- /dev/null
+++ b/4077_net/test/in.txt
@@ -0,0 +1,8 @@
+3 2
+
+6 7
+8 6
+8 4
+
+1 2
+3 2
diff --git a/4077_net/test/in3.txt b/4077_net/test/in3.txt
new file mode 100644
index 0000000..aa6b854
--- /dev/null
+++ b/4077_net/test/in3.txt
@@ -0,0 +1,14 @@
+5 6
+
+1 3
+2 4 
+5 6
+5 8
+6 8
+
+1 2
+3 4
+5 2
+4 1
+2 4
+5 4
\ No newline at end of file
diff --git a/4077_net/test/out.txt b/4077_net/test/out.txt
new file mode 100644
index 0000000..c79405f
--- /dev/null
+++ b/4077_net/test/out.txt
@@ -0,0 +1,24 @@
+## z:\Chao\src\4077_net\test\in.txt 
+2020/04/04 周六 12:33:42.43 
+10
+-----------------------------------------------
+Process exited after 240 ms with return value 0
+
+## z:\Chao\src\4077_net\test\In1 (15).txt 
+2020/04/04 周六 12:33:42.43 
+389382416
+-----------------------------------------------
+Process exited after 120 ms with return value 0
+
+## z:\Chao\src\4077_net\test\In2 (7).txt 
+2020/04/04 周六 12:33:42.43 
+26819096
+-----------------------------------------------
+Process exited after 110 ms with return value 0
+
+## z:\Chao\src\4077_net\test\in3.txt 
+2020/04/04 周六 12:33:42.43 
+20
+-----------------------------------------------
+Process exited after 130 ms with return value 0
+