diff --git a/GESP/GESP九月四级C++真题.pdf b/GESP/GESP九月四级C++真题.pdf
index 414b341..76e06c6 100644
Binary files a/GESP/GESP九月四级C++真题.pdf and b/GESP/GESP九月四级C++真题.pdf differ
diff --git a/GESP/sizeof.cpp b/GESP/sizeof.cpp
new file mode 100644
index 0000000..723f272
--- /dev/null
+++ b/GESP/sizeof.cpp
@@ -0,0 +1,47 @@
+#include <bits/stdc++.h>
+using namespace std;
+
+bool issimilar(string a, string b) {
+	if (abs((int)a.size() - (int)b.size()) > 1)
+		return false;
+	if (a.size() == b.size()) {
+		int cnt = 0;
+		for (int i = 0; i < a.size(); i++) {
+			if (a[i] != b[i])
+				if (cnt++ > 1)
+					return false;
+		}
+		return true;
+	} else {
+		int cnt = 0;
+		if (a.size() > b.size())
+			swap(a, b);
+		int j = 0;
+		for (int i = 0; i < a.size();) {
+			if (a[i] != b[j]) {
+				cnt++;
+				j++;
+			} else {
+				i++;
+				j++;
+			}
+		}
+		if (cnt > 1)
+			return false;
+		return true;
+	}
+}
+
+int main() {
+	int T;
+	cin >> T;
+	while (T--) {
+		string a, b;
+		cin >> a >> b;
+		if (issimilar(a, b)) {
+			cout << "similar" << endl;
+		} else
+			cout << "not similar" << endl;
+	}
+	return 0;
+}
diff --git a/充电桩协议.txt b/充电桩协议.txt
new file mode 100644
index 0000000..a5dc0b9
--- /dev/null
+++ b/充电桩协议.txt
@@ -0,0 +1,2 @@
+【吐血整理】99.5%充电桩设备接入的终极指南 云快充协议！——慧哥慧知充电桩开源系统V2.5.5
+https://blog.csdn.net/Roinli/article/details/138178245
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