1.

#include <iostream>
using namespace std;
int main() {
    int N;
    do {
        cout << "N: ";
        cin >> N;
    }while(N <= 0);
    float * polje = new float[N];
    for(int i = 0; i < N; i++) {
        cout << "Broj: ";
        cin >> polje[i];
    }
    float max;
    int it = 0;
    for(int i = 0; i < N; i++) {
        max = polje[i];
        it = i;
        for(int j = i; j < N; j++)
            if(polje[j] > max) {
                max = polje[j];
                it = j;
            }
        if(it != i)
            swap(polje[i], polje[it]);
    }

    for(int i = 0; i < N; i++)
        cout << polje[i] << endl;
    return 0;
}