添加了许多代码文件

「例题1-4」鸡兔同笼.cpp

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+#include <iostream>
+#include <iomanip>
+#include <cstring>
+#include <cstdio>
+#include <ctime>
+#include <cmath>
+using namespace std;
+int main(){
+	int a,b;
+	cin >>a>>b;
+	long long flag=0;
+	for(int i=0;i<=a;i++){
+		for(int j=0;j<=a;j++){
+			if(i*2+j*4==b && i+j==a){
+				cout <<i<<" "<<j;
+			}
+			else{
+				flag++;
+			}
+		}
+	}
+	if(flag==(a+1)*(a+1)){
+		cout <<"No answer";
+	}
+	return 0;
+}