Решение задачи Array 49

#include <stdio.h>
int main(void)
{
    int a[10];
    int n;
 
    printf("N: ");
    scanf("%i",&n);
 
    int i;
    for (i=0; i<n; ++i){
        printf("a[%i] : ",i+1);
        scanf("%i",&a[i]);
    }
 
 
    int i2;
    for (i=1; i<=n;++i){
        for (i2=0; i2<n;++i2){
            if (a[i2]==i){
                i2=n+100;
                break;
            }
 
        }
        if (i2!=n+100){
            printf("%i \n",i);
            break;
        }
 
    }
    if (i==n+1){
        printf("%i \n",0);
    }
 
    return 0;
}

import random

N = random.randrange(2,21)
#a = [i+1 for i in range(N)]
a = [random.randrange(1,N+1) for i in range(N)]
random.shuffle(a)

print("N:",N)
print("Array:",a)

L = sorted(a)
for i in range(1,N+1) :
    if i != L[i-1] :
        break

if i == N :
    print("perestanovka")
else :
    for i in range(1,N+1) :
        if i != a[i-1] :
            print("first wrong:",a[i-1])
            break
									

program Array49;
var
  a:array[1..10] of integer;
  N,i,i2:Integer;
  check: Boolean;
 
 
begin
  Write('N: ');
  Readln(N);
 
  for i:=1 to N do
   begin
    write(i,' :');
    readln(a[i]);
   end;
 
  for i:=1 to N do
   begin
    check:=False;
    for i2:=1 to N do
      if i=a[i2] then check:=True;
    if not(check) then
     begin
      Writeln (i);
      break;
     end;
   end;
   if check then Writeln(0);
end.