Submission #1102502

#	Time	Username	Problem	Language	Result	Execution time	Memory
1102502		nathan4690	Weird Numeral System (CCO21_day1problem2)	C++17	Compilation error	0 ms	0 KiB

Main

#include <bits/stdc++.h>
#define ll long long
#define ld long double
#define el cout << '\n'
#define f1(i,n) for(int i=1;i<=n;i++)
#define __file_name ""
using namespace std;
const ll maxn = 1e6+5, inf=1e18;

int k,q,d,m,a[maxn];
ll n;
vector<ll> mp[maxn], ans;
unordered_map<ll, bool> flag;

bool check(ll n){
    if(flag.find(n) != flag.end()) return false;
    flag[n] = true;
    ll v = (n % k + k) % k;
    for(int item: mp[v]){
        if(item == n){
            ans.push_back(item);
            return 1;
        }else if(check((n - item) / k)){
            ans.push_back(item);
            return 1;
        }
    }
    return 0;
}

int main(){
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);

    if(fopen(__file_name ".inp", "r")){
        freopen(__file_name ".inp","r",stdin);
        freopen(__file_name ".out","w",stdout);
    }
    // code here
    cin >> k >> q >> d >> m;
    f1(i,d) {
        cin >> a[i];
        mp[(a[i] % k + k) % k].push_back(a[i]);
    }
    while(q--){
        cin >> n;
        flag.clear();
        ans.clear();
        if(check(n)){
            // reverse(ans.begin(), ans.end());
            for(int i=0;i<ans.size();i++) {
              cout << item;
              if(i < ans.size() - 1) cout << " ";
            }
            el;
        }else cout << "IMPOSSIBLE\n";
    }
    return 0;
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:50:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   50 |             for(int i=0;i<ans.size();i++) {
      |                         ~^~~~~~~~~~~
Main.cpp:51:23: error: 'item' was not declared in this scope
   51 |               cout << item;
      |                       ^~~~
Main.cpp:52:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   52 |               if(i < ans.size() - 1) cout << " ";
      |                  ~~^~~~~~~~~~~~~~~~
Main.cpp:35:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   35 |         freopen(__file_name ".inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:36:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   36 |         freopen(__file_name ".out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~