Submission #651327

#	Time	Username	Problem	Language	Result	Execution time	Memory
651327		mychecksedad	Bank (IZhO14_bank)	C++17	100 / 100	102 ms	6860 KiB

bank

/* Author : Mychecksdead */
#include<bits/stdc++.h>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
using namespace std;
typedef long long int ll;
typedef long double ld;
#define MOD (1000000000+7)
#define MOD1 (998244353)
#define PI 3.1415926535
#define pb push_back
#define setp() cout << setprecision(15)
#define all(x) x.begin(), x.end()
#define debug(x) cerr << #x << " is " << x << '\n';
const int N = 1e6+100, M = 1e5+10, F = 2147483646, K = 23;


int n, m, a[N], b[N];
vector<int> v[1005], bank, used(K), sums[1005], people, dp[K];
bitset<(1<<20)> dpp[K];
void solve(){
    cin >> n >> m;
    for(int i = 1; i <= n; ++i) cin >> a[i];
    for(int i = 1; i <= m; ++i) cin >> b[i];

    if(n>m){
        cout << "NO";
        return;
    }

    cerr<<"time taken : "<<(float)clock() / CLOCKS_PER_SEC<<" seconds\n";

    for(int i = 1; i <= n; ++i) v[a[i]].pb(i);
    for(int i = 1; i <= m; ++i){
        if(!v[b[i]].empty()){
            used[v[b[i]].back()] = 1;
            v[b[i]].pop_back();
        }else{
            bank.pb(b[i]);
        }
    }
    for(int i = 1; i <= n; ++i) if(!used[i]) people.pb(a[i]);
    m = bank.size();
    n = people.size();
    if(m < 2*n){
        cout << "NO";
        return;
    }
    if(!n){
        cout << "YES";
        return;
    }
    for(int mask = 0; mask < (1<<m); ++mask){
        int sum = 0;
        for(int j = 0; j < m; ++j) if((1<<j)&mask) sum += bank[j];
        if(sum <= 1000) sums[sum].pb(mask);
    }

    dp[0] = sums[people[0]];
    for(int j = 1; j < n; ++j){
        bool ok = 0;
        for(int submask: dp[j - 1]){
            for(int subbank: sums[people[j]]){
                if(!(submask & subbank)){
                    ok = 1;
                    if(!dpp[j][subbank|submask]){
                        dpp[j][subbank|submask] = 1;
                        dp[j].pb(subbank|submask);
                    }
                }
            }
        }                    
    }
    if(!dp[n - 1].empty()){
        cout << "YES";
    }else{
        cout << "NO";
    }
}





int main(){
    cin.tie(0); ios::sync_with_stdio(0);
    int T = 1, aa;
    // cin >> T;aa=T;
    while(T--){
        // cout << "Case #" << aa-T << ": ";
        solve();
        cout << '\n';
    }
    cerr<<"time taken : "<<(float)clock() / CLOCKS_PER_SEC<<" seconds\n";
    return 0;
 
}

Compilation message (stderr)

bank.cpp: In function 'void solve()':
bank.cpp:61:14: warning: variable 'ok' set but not used [-Wunused-but-set-variable]
   61 |         bool ok = 0;
      |              ^~
bank.cpp: In function 'int main()':
bank.cpp:87:16: warning: unused variable 'aa' [-Wunused-variable]
   87 |     int T = 1, aa;
      |                ^~

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