порядковый номер желаемого элемента

#include <iostream>
#include <ctime>
using namespace std;
 
int main(int argc, char *argv[])
{
srand((unsigned)time(NULL));
const int N=20;
int mas[N];
int n=rand()%(20)+1;
for (int i=0;i<n;i++)
{
mas[i]=rand()%(201)-100;
printf("%d ",mas[i]);
}
printf(" \n");
system("PAUSE");
return EXIT_SUCCESS;
}

#include<iostream>
#include<ctime>
#include<cstdlib>
#include<algorithm>
#include<iterator>
 
int main(){
    srand((unsigned)time(NULL));
    const int N=20;
    int mas[N];
    int n=rand()%(20)+1;
    for (int i=0; i<n; i++){
        mas[i]=rand()%10-5;
        std::cout<<mas[i]<<"  ";
    }
    std::cout<<"\nElement= ";
    std::cin>>n;
    auto it=std::find(mas, mas+N, n);
    if(it!=mas+N){
        do{
            std::cout<<"\nIndex= "<<std::distance(mas, it);
            it=std::find(++it, mas+N, n);
        }while(it!=mas+N);
    }
    else std::cout<<"Element not found\n";
}

#include<iostream>
#include<time.h>
#include<conio.h>
using namespace std;
int randMinMax(int min, int max)
{
int x = 0;
do
x = rand() < rand()? rand() * -1 : rand();
while(x < min || x > max);
return x;
}
int main()
{
srand(time(0));
int size = randMinMax(15,30), num;
bool coin = true;
int *matrix = new int[size];
for(int i = 0; i < size; i++)
matrix[i] = randMinMax(-20,20);
for(int i = 0; i < size; i++)
cout << matrix[i] << " ";
cout << "\n" << "Input number:";
cin >> num;
for(int i = 0; i < size; i++)
{
if(matrix[i] == num)
{
cout << "Number " << num << " is numbered " << i << "\n";
coin = false;
}
}
if(coin)
cout << "The matrix of these has been found. \n";
delete[] matrix;
getch();
return 0;
}