合肥工业大学oj 1249 画菱形

//这个题我的写法非常不优美，很别扭
#include<iostream>
using namespace std;

int n;

int main(){
    while(cin >> n){
        for(int i = 0; i < n / 2; i++){
            cout << " ";
        }
        cout << "*" << endl;
        
        int index_1 = (n - 2) / 2, index_2 = (n - 2) - ((n - 2) / 2 - 1), len = (n - 2) - ((n - 2) / 2 - 1) + 1;
        for(int i = 0; i < (n - 2) / 2; i++){
            for(int j = 0; j < len; j++){
                if(j == index_1 || j == index_2){
                    cout << "*";
                }else{
                    cout << " ";
                }
            }
            cout << endl;
            index_1--;
            index_2++;
            len++;
        }
        
        cout << "*";
        for(int i = 0; i < n - 2; i++){
            cout << " ";
        }
        cout << "*" << endl;
        
        index_1 = 1, index_2 = n - 2, len = n - 1;
        for(int i = 0; i < (n - 2) / 2; i++){
            for(int j = 0; j < len; j++){
                if(j == index_1 || j == index_2){
                    cout << "*";
                }else{
                    cout << " ";
                }
            }
            cout << endl; 
            index_1++;
            index_2--;
            len--;
        }
        
        for(int i = 0; i < n / 2; i++){
            cout << " ";
        }
        cout << "*" << endl;
        cout << endl;
    }
    
    return 0;
}

//presented by 大吉大利，今晚AC