c++程序设计的题目，求解答

输入个数 n， 然后再输入 n 个整数，求所有整数的总和、最大值、最小值， 并求最大值和 最小值的出现的位置，如果值相同，则取最后的位置。

#include
using namespace std;

int main(){
//Enter the numbers
int n;
cout << "Enter how many numbers and all numbers";
cin >> n;
int num[n];
for(int i = 0; i < n; i++)
cin >> num[i];
//Output the minmum number, maxmum number and sum

int sum = 0;
int maxNum, minNum, minI, maxI;
maxNum = num[0];
minNum = num[0];
minI = 0;
maxI = 0;

for(int j = 0; J < n; j++){
    sum += num[j];
    if(minNum >= num[j]){
            minNum = num[j];
            minI = j;
    }
    if(maxNum <= num[j]){
            maxNum = num[j];
            maxI = j;
    }
}
cout << "The sum of the numbers is " << sum;
cout << "The maxmum and the minnum of the numbers is " << maxNum << " and " << minNum;
cout << "The location of the maxmum and the minnum of the numbers is" << maxI << " and " << minI;

return 0;

}