Submission #165769

#	Time	Username	Problem	Language	Result	Execution time	Memory
165769		Mercenary	Bank (IZhO14_bank)	C++14	100 / 100	252 ms	14588 KiB

bank

#include<bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/trie_policy.hpp>

#define pb push_back
#define mp make_pair
#define taskname "A"

using namespace std;
using namespace __gnu_pbds;

typedef long long ll;
typedef long double ld;
typedef pair<int,int> ii;
typedef tree <int,null_type,less<int>,rb_tree_tag,tree_order_statistics_node_update> ordered_set;

const int maxn = 2e5 + 5;
const int logn = log2(maxn) + 1;

const int mod = 1e9 + 7;
int n , m;
int a[maxn] , b[maxn];
vector<int> can[21];
bool dp[21][1 << 20];
void dfs(int u , int mask){
    if(u == n){
        cout << "YES";
        exit(0);
    }
    if(dp[u][mask])return;
    dp[u][mask] = 1;
    for(int c : can[u + 1]){
        if(!(c & mask))dfs(u + 1 , mask | c);
    }
}
int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    if(fopen(taskname".INP","r")){
		freopen(taskname".INP", "r",stdin);
		freopen(taskname".OUT", "w",stdout);
    }
    srand(time(0));
    cin >> n >> m;
    for(int i = 1 ; i <= n ; ++i){
        cin >> a[i];
    }
    for(int i = 0 ; i < m ; ++i){
        cin >> b[i];
    }
    for(int i = 1 ; i < (1 << m) ; ++i){
        int s = 0;
        for(int j = 0 ; j < m ; ++j){
            if(i & (1 << j))s += b[j];
        }
        for(int j = 1 ; j <= n ; ++j){
            if(a[j] == s)can[j].pb(i);
        }
    }
    dfs(0,0);
    cout << "NO";
}

Compilation message (stderr)

bank.cpp: In function 'int main()':
bank.cpp:41:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   freopen(taskname".INP", "r",stdin);
   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
bank.cpp:42:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   freopen(taskname".OUT", "w",stdout);
   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~

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