C++中的数组出错

问题是我想要'o'，而不是重复。。。我试着找，但失败了！还要向我解释这是怎么发生的。我是一个新的学习程序员！

#include <iostream>
#include <string>
#include <stdio.h>
#include <stdlib.h>
#include <conio.h>
#include <time.h>
using namespace std;
int main()
{
    //all in-game variables here
    string o = "o";
    int oH = 0;
    int oW = 0;
    //variables ending point...
    bool run = true;
    bool frameShow = true;
    char input;
    int width = 53;
    int height = 22;
    string px[width][height];
    while (run)
    {
        for (int xEmp=0; xEmp<height;    xEmp++){
            for (int yEmp=0; yEmp<width; yEmp++) 
            {
                px[xEmp][yEmp]= " ";
            }
            if (frameShow)
            {
                clrscr();           // Must be at start
                px[oH][oW] = o;
                for (int x=0; x<height; x++)
                {
                    for (int y=0; y<width; y++)
                    {
                        cout << px[x][y];
                    }
                    cout << "n";
                    frameShow = false;   // Must be at end
                }
            }
            if (kbhit())
            {
                input = getch();
                // Most Used ones are:
                // char 119 for "w"
                // char 97 for "a"
                // char 115 for "s"
                // char 100 for "d"
                // char 32 for "space"
                // char 27 for ESC
                if (input == 119)
                {
                    oH--;
                    frameShow = true;
                }
                else if (input == 115)
                {
                    oH++;
                    frameShow = true;
                }
                else if (input == 97)
                {
                    oW--;
                    frameShow = true;
                }
                else if (input == 100)
                {
                    oW++;
                    frameShow = true;
                }
                else if (input == 27)
                {
                    // Game exits...
                    // To terminate, use:
                    run = false;
                }
                if(oH > height)
                {
                    oH = height;
                }
                else if(oH < 0)
                {
                    oH = 0;
                }
                if(oW > width - 1)
                {
                    oW = width - 1;
                }
                else if(oW < 0)
                {
                    oW = 0;
                }
            }
        }
    }
    // Output for confiming program termination
    clrscr();
    cout << "n  - Terminated! - n";
    return 0;
}