Submission #977998

#	Time	Username	Problem	Language	Result	Execution time	Memory
977998		BentoOreo	Bank (IZhO14_bank)	C++14	52 / 100	1037 ms	44740 KiB

bank

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using pii = pair<int, int>;
using pll = pair<long long, long long>;
const ll INF = numeric_limits<ll>::max();
const int inf = numeric_limits<int>::max();
const char nl = '\n', sp = ' ';


ll cantor_hash(ll x, ll y){
    ll ans = (((x + y) * (x + y + 1)) >> 1) + y;
    // cout << ans << nl;
    return ans;
}
unordered_map<ll,bool> vis;
bool f(int id, ll mask, ll val, int M, vector<ll> &salary, vector<ll> &billz ){
    // cout << id << sp << mask << sp << val << nl;
    if(vis.count(cantor_hash(mask,val))){
        return vis[cantor_hash(mask,val)];
    } else {
        if(id == salary.size()){
            return true;
        } else if(val == 0){
            return f(id + 1,mask,salary[id + 1], M, salary, billz);
        } else {
            bool flag = false;
            for(int i = 0; (i < M) && (val - billz[i] >= 0); i++){
                if((mask & (1 << i)) != 0){
                    flag = flag | f(id, mask ^ (1 << i),val - billz[i],M, salary,billz);
                        // flag = true;
                }
            }
            vis[cantor_hash(mask,val)] = flag;
            return flag;
        }
    }
}

int main(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int N, M;
    cin >> N >> M;
    vector<ll> salary;
    vector<ll> billz;
    ll num;
    for(int i = 0; i < N; i++){
        cin >> num;
        salary.push_back(num);
    }
    for(int i = 0; i < M; i++){
        cin >> num;
        billz.push_back(num);
    }
    sort(billz.begin(),billz.end());
    ll mask = (1 << M) - 1;
    bool ans = f(0,mask,salary[0], M ,salary, billz);
    if(ans){
        cout << "YES" << nl;
    } else {
        cout << "NO" << nl;
    }
}

Compilation message (stderr)

bank.cpp: In function 'bool f(int, ll, ll, int, std::vector<long long int>&, std::vector<long long int>&)':
bank.cpp:22:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   22 |         if(id == salary.size()){
      |            ~~~^~~~~~~~~~~~~~~~

• Subtask 1: 0 / 19
• Subtask 2: 25 / 25
• Subtask 3: 27 / 27
• Subtask 4: 0 / 29