C, pasted on Sep 28:
 ```1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 ``` ```#include #include #include #define MAX 100 void nhap (int a[], int &n) { do { printf("\nNhap so phan tu: "); scanf("%d", &n); if(n <= 0 || n > MAX) { printf("\nSo phan tu khong hop le. Xin kiem tra lai !"); } }while(n <= 0 || n > MAX); for(int i = 0; i < n; i++) { printf("\nNhap a[%d]: ", i); scanf("%d", &a[i]); } } void xuat(int a[], int n) { for(int i = 0; i < n; i++) { printf("%8d", a[i]); } } /* VD: 12 34 134 thì ta dc 1 mảng số: Trị số : 0 1 2 3 4 5 6 7 8 9 Giá trị: 0 2 1 2 2 0 0 0 0 0 */ void DemChuSo(int a[], int n, int b[]) { // Duyệt mảng a for (int i = 0; i < n; i++) { int themang = abs(a[i]); while (themang != 0) { int ChuSo = themang % 10; themang /= 10; b[ChuSo]++; } } } int TimChuSoXuatItNhat(int a[], int n, int b[]) { int ChuSoMin = abs(a[0] % 10); for (int i = 0; i < 10 ; i++) { if (b[i] != 0) { ChuSoMin = (b[ChuSoMin] < b[i]) ? ChuSoMin : i; } } return ChuSoMin; } int main() { int n; int a[MAX]; nhap(a, n); xuat(a, n); int b[10] = {0}; DemChuSo(a, n, b); for (int i = 0; i < 10; i++) { // Chỉ xét những chữ số có số lần xuất hiện > 0 if (b[i] != 0) { printf("\nChu so %d xuat hien %d lan", i, b[i]); } } int ChuSoMin = TimChuSoXuatItNhat(a, n, b); printf ("\nChu so xuat hien it nhat la %d",ChuSoMin); getch(); return 0; } ```

Output:
 ```1 2 3 4 5 6 7 8 9 10 ``` ```Line 17: error: conio.h: No such file or directory Line 6: error: expected ';', ',' or ')' before '&' token In function 'xuat': Line 26: error: 'for' loop initial declaration used outside C99 mode In function 'DemChuSo': Line 42: error: 'for' loop initial declaration used outside C99 mode In function 'TimChuSoXuatItNhat': Line 57: error: 'for' loop initial declaration used outside C99 mode In function 'main': Line 78: error: 'for' loop initial declaration used outside C99 mode ```

#include<iostream>
#include<cmath>
using namespace std;
void Nhap(int n, int a[]){
for(int i=0; i<n; i++){
cout<<"a["<<i<<"] = ";
cin>>a[i];
}
}
int solan_min(int n, int a[]){
int b[10]={0};
for(int i=0; i<n; i++){
int temp=abs(a[i]);
while(temp!=0){
int du=temp%10;
b[du]++;
temp/=10;
}
}
int min=10000, x_min=0;
for(int i=0; i<=9; i++){
if(b[i]>0 && b[i]<min){
min=b[i];
x_min=i;
}
}
return x_min;
}
main(){
int n;
cout<<"Nhap so phan tu trong mang: ";
cin>>n;
int a[n];
Nhap(n,a);
cout<<"Chu so xuat hien it nhat la: "<<solan_min(n,a)<<endl;
}