认真做题

#include<bits/stdc++.h>
using namespace std;
int main(){
    int m, n;
    cin>>m>>n;
    int h=n/2;
    int w=n+m-1;
    for (int i=1;i<=h+n%2;i++) {
        for (int j=1;j<i;j++){
            cout<<".";
        }
        if (w-2*(i-1)>m*2) {
            for(int j=0; j<m; ++j){
                cout<<"*";
            }
            for(int j=0; j<w-2*(i-1)-m*2;j++){
                cout<<".";
            }
            for(int j=0;j<m;j++){
                cout<<"*";
            }
        } 
        else {
            for(int j=0; j<w-2*(i-1);j++){
                cout<<"*";
            }
        }
        for(int j=1;j<i;j++){
            cout << ".";
        }
        cout<<endl;
    }
    for (int i=h;i>=1;i--) {
        for (int j=1;j<i;j++){
            cout<<".";
        }
        if (w-2*(i-1)>m*2) {
            for (int j=1;j<=m;j++){
                cout<<"*";
            }
            for (int j=1;j<=w-2*(i-1)-m*2;j++){
                cout<<".";
            }
            for (int j=1;j<=m;j++){
                cout<<"*";
            }
        } 
        else {
            for (int j = 1; j <= w - 2 * (i - 1); ++j) cout << "*";
        }
        for (int j = 1; j < i; ++j) cout << ".";
        cout << endl;
    }
    return 0;
}