AtCoder Beginner Contest 170

#include<iostream>
#include<algorithm>

using namespace std;

int main(){
    int a[5];
    for(int i=1;i<=5;i++){
    cin>>a[i];
    if(a[i] == 0) cout<<i<<endl;
    }

}

#include<iostream>
#include<algorithm>
 
using namespace std;
 
int main(){
	int x,y;
	cin>>x>>y;
	int tot;
	bool flag = 0;
	for(int i=0;i<=x;i++){
		tot = 0;
		tot += i*2 + (x-i)*4;
		if(tot == y){
			cout<<"Yes"<<endl;
			flag = 1;
			break; 
		}
	}
	if(!flag) cout<<"No"<<endl;
	return 0;
}

#include<iostream>
#include<algorithm>
#define inf 0x3f3f3f3f
using namespace std;
 
int a[1000]={0};
 
int main(){
	int x,n;
	cin>>x>>n;
	int re;
	for(int i=0;i<n;i++){
	cin>>re;
	a[re]++;	
	}
	
	int ans,res,ans1=inf,res1;
	for(int i=x;i<=101;i++){
		if(a[i]==0){
		ans = i - x;
		res = i;
		break;	
		} 
	}
	for(int i=x-1;i>=0;i--){
		if(a[i]==0){
		ans1 = min(ans1,x - i);
		res1 = i;
		break;	
		}
	}
	if(ans < ans1) cout<<res<<endl;
	if(ans == ans1) cout<<res1<<endl;
	if(ans > ans1) cout<<res1<<endl;
	return 0;
}

#include <cstdio>
#include <algorithm>
using namespace std;
int vis[1000010],a[200010],in[1000010];
int main(){
	int n,i,j,cnt,mn=1000010,mx=0,ans=0;
	scanf("%d",&n);
	for(i=1;i<=n;i++)scanf("%d",&a[i]),vis[a[i]]++,in[a[i]]=1,mn=min(mn,a[i]),mx=max(mx,a[i]);
	for(i=1;i<=n;i++){
		cnt=1;
		while(1){
			cnt++;
			if(a[i]*cnt>mx)break;
			vis[a[i]*cnt]++;
		}
	}
	for(i=mn;i<=mx;i++)
		if(in[i]==1&&vis[i]==1)ans++;
	printf("%d\n",ans);
	return 0;
}