Flexible Spaces Solution:

#include <bits/stdc++.h>
using namespace std;

int main(){
    // #ifndef ONLINE_JUDGE
    // freopen("input.txt", "r", stdin);
    // freopen("output.txt", "w", stdout);
    // #endif

    int room, partitions;
    cin >> room >> partitions;
    int breakpoint;
    vector<int> breakpoints = {0};
    bool possibilies[room + 1] = {};
    for(int i = 0; i < partitions; i++){
        cin >> breakpoint;
        for(int j:breakpoints){
            possibilies[breakpoint - j] = true;
        }
        breakpoints.push_back(breakpoint);
    }
    breakpoints.push_back(room);
    for(int i:breakpoints){
            possibilies[room - i] = true;
        }
    for(int i = 1; i <= room; i++){
        if(possibilies[i]){
            cout << i << " ";
        }
    }
    
	return 0;
}