Submission #496670

#	Time	Username	Problem	Language	Result	Execution time	Memory
496670		SinsAries	Bank (IZhO14_bank)	C++17	100 / 100	136 ms	16816 KiB

bank

#include<bits/stdc++.h>

using namespace std;

// type
using ll = long long;
using ld = long double;
using db = double;
using str = string;

// pairs
using pi = pair<int,int>;
using pl = pair<ll,ll>;
using pd = pair<db,db>;

// vector
using vi = vector<int>;
using vb = vector<bool>;
using vl = vector<ll>;
using vd = vector<db>;
using vs = vector<str>;
using vpi = vector<pi>;
using vpl = vector<pl>;
using vpd = vector<pd>;
#define pb push_back
#define pf push_front
#define all(x) x.begin(), x.end()
#define sz(x) x.size()
#define sor(x) sort(all(x))
#define rsz resize
#define rtn return

// binary search
#define lb lower_bound
#define ub upper_bound
template<class T> ll lwb(vector<T>& a, const T& b) { rtn lb(all(a), b) - a.begin(); }
template<class T> ll upb(vector<T>& a, const T& b) { rtn ub(all(a), b) - a.begin(); }

// pairs
#define mp make_pair
#define f first
#define s second

// loops
#define FOR(i,a,b) for (ll i = (a); i < (b); ++i)
#define F0R(i,a) FOR(i,0,a)
#define ROF(i,a,b) for (ll i = (b)-1; i >= (a); --i)
#define R0F(i,a) ROF(i,0,a)
#define each(a,x) for (auto& a: x)
#define cont continue
#define bre break

// FILE I/O
void setIn(str s) { freopen(s.c_str(),"r",stdin); }
void setOut(str s) { freopen(s.c_str(),"w",stdout); }
void setIO(str s) {
    setIn(s+".inp"); setOut(s+".out");
}

const int MOD =  1e9 + 7; //998244353;
const int MX = 2e5+5;
const ll INF = 1e9;
const db PI = acos((db)-1);
const int dx[4] = {1,0,-1,0}, dy[4] = {0,1,0,-1};
template<class T> using pqg = priority_queue<T,vector<T>,greater<T>>;

// modulo, exponentiation, inverse
ll pow_mod(ll a, ll b, ll m) { ll res = 1; while(b){ res = res * (b & 1 ? a : 1) % m; a = a * a % m; b >>= 1; } rtn res; }
ll inv(ll a, ll m) { rtn pow_mod(a, m - 2, m); }

ll nxt(void){ // fast way for cin operation
    ll x; cin >> x;
    rtn x;
}

#define isOn(i, mask) ((mask >> i) & 1)

ll n, m, a[20], b[20];

pl dp[1 << 20];

void init(void){
    cin >> n >> m;
    F0R(i, n) cin >> a[i];
    F0R(i, m) cin >> b[i];
    F0R(mask, 1 << n) dp[mask] = {-INF, 0};
    dp[0] = {0, 0};
}

void solve(void){
    F0R(mask, 1 << m){
        if(dp[mask].f == -INF) cont;

//        cout << mask << ' ' << dp[mask].f << ' ' << dp[mask].s << '\n';

        if(dp[mask].f == n){
            cout << "YES";
            rtn;
        }

        F0R(i, m) if(!isOn(i, mask)){
            ll newVal = dp[mask].s + b[i];

            if(newVal < dp[mask | (1 << i)].f) cont;

            ll target = a[dp[mask].f];

            if(newVal < target)
                dp[mask | (1 << i)] = max(dp[mask | (1 << i)],{dp[mask].f, newVal});
            else if(newVal == target)
                dp[mask | (1 << i)] = max(dp[mask | (1 << i)], {dp[mask].f + 1, 0});
        }
    }
    cout << "NO";
}

int main(){
    ios_base::sync_with_stdio(false); cin.tie(0);
//    setIO("CodeforcesEasy");

    init();
    solve();

    rtn 0;
}

Compilation message (stderr)

bank.cpp: In function 'void setIn(str)':
bank.cpp:54:28: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   54 | void setIn(str s) { freopen(s.c_str(),"r",stdin); }
      |                     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~
bank.cpp: In function 'void setOut(str)':
bank.cpp:55:29: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   55 | void setOut(str s) { freopen(s.c_str(),"w",stdout); }
      |                      ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~

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