更新了许多

小码君的烦恼.cpp

@@ -0,0 +1,27 @@
+#include <iostream>
+#include <iomanip>
+#include <cstring>
+using namespace std;
+int main(){
+	char a[10000];
+	int b=0;
+	cin >>a;
+	if(a[0]>='0' && a[0]<='9'){
+		cout <<"no";
+		return 0;
+	}
+	for(int i=1;i<strlen(a);i++){
+		if((a[i]>='a' && a[i]<='z') || (a[i]>='A' && a[i]<='Z') || (a[i]>='0' && a[i]<='9') || a[i]=='_'){
+			b++;
+		}
+	}
+	if(b==strlen(a)-1){
+		cout <<"yes";
+	}
+	else{
+		cout <<"no";
+	}
+	return 0;
+}
+
+