[C ++] characters with inverted triangle design cycle

#include<iostream>
using namespace std;
int main(){
	for (int i=1;i<=10;i++){
		for (int j=1;j<=i-1;j++){ //j可以从1到i-1（最小为0） 
			cout<<' ';
		}
		for (int k=1;k<=(21-2*i);k++){
			cout<<'M';
		}
		cout<<endl; 
	}
	return 0;
}