Submission #1184028

#	Time	Username	Problem	Language	Result	Execution time	Memory
1184028		hmms127	Bank (IZhO14_bank)	C++20	0 / 100	145 ms	327680 KiB

bank

#include <bits/stdc++.h>
using namespace std;
#define f1(n) for(int i=0;i<n;i++)
#define e '\n'
#define f3(n) for(int j=0;j<n;j++)
#define speed ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0)
#define int long long
#define pb push_back

int setbit(int n,int idx,int val){return (val ? ((1LL<<idx)|n):(~(1LL<<idx)&n));}
int getbit(int n,int idx){return ((n>>idx)&1LL);}
const int N=21;
int n,m,a[N],b[N],dp[N][1<<N];bool vis[N];
bool rec(int idx,int mak){
  if(idx==n)return 1;
  int& ret=dp[idx][mak];
  if(ret!=-1)return ret;
  int newmask=mak;
  for(int mask=0;mask<(1<<m);++mask){
    vector<int> v;bool valid=true;int sm=0;
    for(int i=0;i<m;i++){
      if(getbit(mask,i)){
        if(getbit(mak,i)){
          valid=false;
          break;
        }
        else v.pb(i),sm+=b[i];
      }
    }
    if(valid&&sm==a[idx]){
      for(auto it:v)newmask=setbit(newmask,it,1);
      if(rec(idx+1,newmask))return ret=true;
      for(auto it:v)newmask=setbit(newmask,it,0);
    }
  }
  return ret=false;
}
int32_t main()
{
     speed;
     int tt=1,cnt=1;//cin>>tt;
     while(tt--){
       freopen("bank.in","r",stdin);
       freopen("bank.out","w",stdout);
      cin>>n>>m;
      f1(n)cin>>a[i];f1(m)cin>>b[i];
      memset(dp,-1,sizeof dp);
      cout<<(rec(0,0) ? "YES":"NO")<<e;
     }
}

Compilation message (stderr)

bank.cpp: In function 'int32_t main()':
bank.cpp:43:15: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   43 |        freopen("bank.in","r",stdin);
      |        ~~~~~~~^~~~~~~~~~~~~~~~~~~~~
bank.cpp:44:15: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   44 |        freopen("bank.out","w",stdout);
      |        ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

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