Submission #431870

#	Time	Username	Problem	Language	Result	Execution time	Memory
431870		Aldas25	Bank (IZhO14_bank)	C++14	100 / 100	183 ms	1368 KiB

bank

#include <bits/stdc++.h>

using namespace std;

#define FAST_IO ios_base::sync_with_stdio(0); cin.tie(0)
#define FOR(i, a, b) for(int i = (a); i <= (b); i++)
#define REP(n) FOR(O, 1, (n))
#define pb push_back
#define f first
#define s second
typedef long double ld;
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<int, pii> piii;
typedef vector<int> vi;
typedef vector<pii> vii;
typedef vector<ll> vl;
typedef vector<piii> viii;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

const int MAXN = 500100, MAXK = 60;
//const ll MOD = 998244353;
const ll MOD = 1e9+7;
const ll INF = 1e17;

int n, m;
int a[MAXN], b[MAXN];
ll pref[MAXN];
bool dp[1<<22];

int main()
{
    FAST_IO;

    cin >> n >> m;
    FOR(i, 1, n) cin >> a[i];
    FOR(i, 0, m-1) cin >> b[i];
    FOR(i, 1, n) pref[i] = pref[i-1] + a[i];

    ll sumA = 0, sumB = 0;
    FOR(i, 1, n) sumA += a[i];
    FOR(i, 0, m-1) sumB += b[i];
    if (sumB < sumA) {
        cout << "NO\n";
        return 0;
    }

    dp[0] = true;
    FOR(mask, 1, (1<<m)-1) {
        int sum = 0;
        FOR(i, 0, m-1) if (mask & (1<<i)) sum += b[i];
        if (sum > pref[n]) continue;

        int le = 0, ri = n;
        while (le < ri) {
            int mid = (le+ri)/2;
            if (pref[mid] >= sum) ri = mid;
            else le = mid+1;
        }
        int id = le;

        FOR(i, 0, m-1) {
            if (! (mask & (1<<i))) continue;
            int prevSum = sum - b[i];
            if (prevSum < pref[id-1]) continue;
            if (dp[mask ^ (1<<i)]) dp[mask] = true;
        }

        if (sum == pref[n] && dp[mask]) {
            cout << "YES\n";
            return 0;
        }
    }

    cout << "NO\n";

    return 0;
}

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