方法2

#include<bits/stdc++.h>
using namespace std;
int a[1000][1000];
int main()
{
int n;
cin >> n;
if(n=20) cout << "*****" << endl;
else if(n>=15) cout << "****" << endl;
else if(n>=10) cout << "***" << endl;
else if(n>=5) cout << "**" << endl;
else if(n>=1) cout << "*" << endl;

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方法1

#include<bits/stdc++.h>
using namespace std;
int a[1000][1000];
int main()
{
int n;
cin >> n;
if(n=20) cout << "*****" << endl;
if(n<20&&n>=15) cout << "****" << endl;
if(n<15&&n>=10) cout << "***" << endl;
if(n<10&&n>=5) cout << "**" << endl;
if(n<5&&n>=1) cout << "*" << endl;