Submission #855114

#	Time	Username	Problem	Language	Result	Execution time	Memory
855114		bestrazhuxp	Bank (IZhO14_bank)	C++17	44 / 100	75 ms	17172 KiB

bank

#include <bits/stdc++.h>
#define ll long long
#define se second
#define fi first
#define pb push_back
#define all(x) (x).begin() , (x).end()
#define sz(x) (int)(x).size()
#define BIT(x , i) ((x) >> (i) & 1)
#define MASK(i) (1LL << (i))
#define name "1"
#define task ""

using namespace std;

const int inf = 1e9 + 7;
const ll linf = 1ll * inf * inf;
const int mod = 1e9 + 7;
const int maxn = 1e5 + 2;
int f[1 << 21];
int a[21];
int b[21];
vector <int> s[maxn];
void file(){if(fopen(task".inp" , "r")){freopen(task".inp" , "r" , stdin);freopen(task".out" , "w" , stdout);}else if(fopen(name".inp" , "r")){freopen(name".inp" , "r" , stdin);freopen(name".out" , "w" , stdout);}}
int n , m;
int main()
{
    file();
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    cin >> n >> m;
    for(int i = 0; i < n; i++) cin >> a[i];
    for(int i = 0 ; i < m; i++) cin >> b[i];
    for(int i = 0 ; i < MASK(m) ; i++)
    {
        int sum = 0;
        for(int j = 0 ; j < m ; j++) if(BIT(i , j)) sum += b[j];
        s[sum].pb(i);
    }
    memset(f , -1, sizeof f);
    f[0] = 0;
    for(int mask = 1; mask < MASK(n) ; mask++)
    {
        for(int j = 0 ; j < n; j++)
        {
            if(BIT(mask , j))
            {
                int prev = mask ^ MASK(j);
                int x = f[prev];
                if(x  < 0) continue;
                    for(auto y : s[a[j]])
                    {
                        if(!(x & y))
                        {
                            f[mask] = x ^ y;
                        }
                    }
            }
        }
    }
    if(f[MASK(n) - 1] < 0) return cout << "NO" , 0;
    cout << "YES";
}

Compilation message (stderr)

bank.cpp: In function 'void file()':
bank.cpp:23:48: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   23 | void file(){if(fopen(task".inp" , "r")){freopen(task".inp" , "r" , stdin);freopen(task".out" , "w" , stdout);}else if(fopen(name".inp" , "r")){freopen(name".inp" , "r" , stdin);freopen(name".out" , "w" , stdout);}}
      |                                         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
bank.cpp:23:82: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   23 | void file(){if(fopen(task".inp" , "r")){freopen(task".inp" , "r" , stdin);freopen(task".out" , "w" , stdout);}else if(fopen(name".inp" , "r")){freopen(name".inp" , "r" , stdin);freopen(name".out" , "w" , stdout);}}
      |                                                                           ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
bank.cpp:23:151: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   23 | void file(){if(fopen(task".inp" , "r")){freopen(task".inp" , "r" , stdin);freopen(task".out" , "w" , stdout);}else if(fopen(name".inp" , "r")){freopen(name".inp" , "r" , stdin);freopen(name".out" , "w" , stdout);}}
      |                                                                                                                                                ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
bank.cpp:23:185: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   23 | void file(){if(fopen(task".inp" , "r")){freopen(task".inp" , "r" , stdin);freopen(task".out" , "w" , stdout);}else if(fopen(name".inp" , "r")){freopen(name".inp" , "r" , stdin);freopen(name".out" , "w" , stdout);}}
      |                                                                                                                                                                                  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

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