添加了许多代码文件

#249. 字符串假肢手术1.cpp

@@ -0,0 +1,21 @@
+#include <iostream>
+#include <cstring>
+#include <cstdio>
+#include <iomanip>
+using namespace std;
+int main(){
+	char a[10000],c;
+	int b;
+	cin >>a>>b>>c;
+	for(int i=0;i<strlen(a);i++){
+		if(i==(b-1)){
+			cout <<c;
+		}
+		else{
+			cout <<a[i];
+		}
+	}
+	return 0;
+}
+
+