Signed-off-by: 10-4 <10-4@sairate.fun>

未命名1.cpp

@@ -0,0 +1,20 @@
+#include<iostream>
+using namespace std;
+int main() {
+	int a;
+	double s;i
+	f(a<=10);{
+		s=0.8*a+0.2;
+		cout<<setprecision(2)<<fixed<<s<<endl;
+	}else if(a<=30){
+				s=0.8*a+0.2;
+		cout<<setprecision(2)<<fixed<<s<<endl;
+	}else if(a<=30){
+				s=0.8*a+0.2;
+		cout<<setprecision(2)<<fixed<<s<<endl;
+	}
+	
+	cin>>a;
+	i
+	return 0;
+}

未命名3.cpp

@@ -0,0 +1,11 @@
+#include<iostream>
+using namespace std;
+int main() {
+	int a; 
+	cin>>a;
+	if (a%4==0&a&100!=0||a%400==0){
+	if{a=}	
+	}
+	return 0;
+}
+

等差数列.cpp

@@ -0,0 +1,8 @@
+#include<iostream>
+using namespace std;
+int main() {
+	int a,b,c;
+	cin>>a>>b>>c;
+	cout<<(b-a)*(c-1)+a;
+	return 0;
+}

计算徽章数量.cpp

@@ -0,0 +1,8 @@
+#include<iostream>
+using namespace std;
+int main() {
+	int a, b;
+	cin>>a>>b;
+	cout<<(a*10+b)/21; 
+	return 0;
+}

闰年判断.cpp

@@ -0,0 +1,11 @@
+#include<iostream>
+using namespace std;
+int main() {
+	int a; 
+	cin>>a;
+	if (a%4==0&a&100!=0||a%400==0){
+	cout<<"是闰年。";}
+	else {cout<< "不是闰年";}
+	return 0;
+}
+