Задача B on c++

#include <iostream>
#include <vector>
using namespace std;

int main(){
    int num;
    cin >> num;
    vector <int> list1;
    int diff;
    for (int n=0; n<num; n++){
        int t;
        cin >> t;
        list1.push_back(t);
    }
    for (int k=num-1; k>0; k--){
        if (list1[k-1] < list1[k]){
            diff = list1[k]-list1[k-1];
            list1[k] = diff-(diff/2+diff%2);
            list1[k-1] = diff/2+diff%2;
        }
    }
    for (int n=0; n<num; n++){
        cout << list1[n] << " ";
    }
}