提交显示6 114514输出不正确 求助！！

#include <stdio.h>
int main()
{
    int num[6][500] = { 0 };
    int n;
    int i = 0, j = 0, k = 0;
    char a[100];
    scanf("%d", &n);
    getchar();
    for (i = 0; i < n; i++) {
        scanf("%c", &a[i]);
    }
    for (i = 0, j = 0; i < n; i++, j += 4) {
        if (a[i] == '2' || a[i] == '3' || a[i] == '5' || a[i] == '6' || a[i] == '8' || a[i] == '9') {
            k = 0;
            for (k = 0; k < 3; k++) {
                num[0][k + j] = 1;
                num[2][k + j] = 1;
                num[4][k + j] = 1;
            }
            if (a[i] == '2' || a[i] == '3' || a[i] == '8' || a[i] == '9') {
                num[1][j + 2] = 1;
            }
            if (a[i] == '3' || a[i] == '5' || a[i] == '6' || a[i] == '8' || a[i] == '9') {
                num[3][j + 2] = 1;
            }
            if (a[i] == '5' || a[i] == '6' || a[i] == '8' || a[i] == '9') {
                num[1][j] = 1;
            }
            if (a[i] == '2' || a[i] == '6' || a[i] == '8') {
                num[3][j] = 1;
            }
        }
        else if (a[i] == '0' || a[i] == '1' || a[i] == '4' || a[i] == '7') {
            k = 0;
            for (k = 0; k < 5; k++) {
                num[k][j + 2] = 1;
            }
            if (a[i] == '0') {
                k = 0;
                for (k = 0; k < 3; k++) {
                    num[0][k + j] = 1;
                    num[4][k + j] = 1;
                }
                for (k = 0; k < 4; k++) {
                    num[k][j] = 1;
                }
            }
            if (a[i] == '4') {
                k = 0;
                for (k = 0; k < 3; k++) {
                    num[k][j] = 1;
                    num[2][k + j] = 1;
                }
            }
            if (a[i] == '7') {
                k = 0;
                for (k = 0; k < 3; k++) {
                    num[0][k + j] = 1;
                }
            }
        }
    }i = 0; j = 0;
    for (i = 0; i < 5; i++) {
        for (j = 0; j < (4 * n - 1); j++) {
            if (num[i][j] == 1) printf("X");
            else printf(".");
        }
        printf("\n");
    }

    return 0;
}