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Untitled1.cpp

+//#include<iostream>
+//using namespace std;
+//int main(){
+//	char x,y;
+//	x='m';
+//	int n;
+//	n=x<y;
+//	cout<<n<<endl;
+//	n=x==y-1;
+//	cout<<n<<endl;
+//	return 0;
+//}
+
+#include<iostream>
+using namespace std;
+int main(){
+	int x;bool p;
+	cin >>x;
+	p=(x&400==0)||(x%4==0)&&(x&100!=0);
+	cout<<p<<endl;
+	return 0;
+}
+
+//#include<iostream>
+//using namespace std;
+//int main(){
+//	int n,m; 
+//	cin>>n;
+//	if(n<=5){
+//		m=n*300;
+//		cout<<m;
+//		return 0;
+//	} else{
+//		m=n*280;
+//		cout<<m;
+//	}
+//		return 0;
+//}
+
+//#include<iostream>
+//using namespace std;
+//int main(){
+//	int x,y,z;
+//	cin>>x>>y>>z;
+//	if(x<=y){
+//		if(y<=z){
+//			cout<<"yes";
+//		}
+//		else{
+//			cout<<"no";
+//		}
+//		
+//	}
+//	else{
+//		cout<<"no";
+//	}
+//	return 0;
+//}
+
+

Untitled2.cpp

+#include<bits/stdc++.h>
+using namespace std;
+
+int main() {
+	int n,m;
+	cin>>n>>m; 
+	printf("%.2lf",n*n*3.14-m*m);	
+	return 0;
+}

Untitled3.cpp

+#include<stdio.h>
+#include<iostream>
+#include<math.h>
+using namespace std; 
+int main(){
+	int n,p,c,s;
+	cin>>n>>p;
+	for(int i=2;i<=n;i++){
+		cin>>c;
+		while(p%c>0){
+			s=p%c;
+			p=c;
+			c=s;
+		}
+		p=c;
+	}
+		cout<<c;
+	return 0;
+}