Submission #1112886

#	Time	Username	Problem	Language	Result	Execution time	Memory
1112886		luvna	Bank (IZhO14_bank)	C++14	100 / 100	78 ms	10712 KiB

bank

#include<bits/stdc++.h>

#define all(v) v.begin(), v.end()
#define endl "\n"

using namespace std;

const int N = 21;

template<class T> bool maximize(T& a, T b) {if(a < b) return a = b, true; return false;}

int n, m;
int a[N], b[N];
int dp[(1 << 21)+15];
int sum[(1 << 21)+15];

void solve(){
    cin >> n >> m;

    for(int i = 0; i < n; i++) cin >> a[i];

    for(int i = 0; i < m; i++) cin >> b[i];

    dp[0] = 1;

    for(int mask = 0; mask < (1 << m); mask++){
        if(!dp[mask]) continue; //useless
        int target = a[dp[mask]-1];
        for(int i = 0; i < m; i++){
            if(mask >> i & 1) continue;
            int nxt_mask = mask + (1 << i);
            if(sum[mask] + b[i] == target){//can satisfy dp[mask]-1 customer
                if(maximize(dp[nxt_mask], dp[mask]+1)) sum[nxt_mask] = 0;
            }
            else{
                if(maximize(dp[nxt_mask], dp[mask])) sum[nxt_mask] = sum[mask] + b[i];
            }
        }
    }

    cout << (dp[(1 << m)-1] == n+1 ? "YES" : "NO") << endl;
}

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

    #define task "task"

    if(fopen(task".INP", "r")){
        freopen(task".INP", "r", stdin);
        freopen(task".OUT", "w", stdout);
    }

    int t; t = 1; //cin >> t;
    while(t--) solve();
}

Compilation message (stderr)

bank.cpp: In function 'int main()':
bank.cpp:51:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   51 |         freopen(task".INP", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
bank.cpp:52:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   52 |         freopen(task".OUT", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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