Submission #1023678

#	Time	Username	Problem	Language	Result	Execution time	Memory
1023678		vjudge1	Knapsack (NOI18_knapsack)	C++17	29 / 100	2 ms	424 KiB

knapsack

#include <bits/stdc++.h>
#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")
#pragma GCC target("avx,avx2,fma")
using namespace std;
#define int long long
#define vec vector
template<typename _T>
bool chmax(_T &a, const _T &b) {
    if (a < b) {
        a = b;
        return true;
    }
    return false;
}
template<typename _T>
bool chmin(_T &a, const _T &b) {
    if (a > b) {
        a = b;
        return true;
    }
    return false;
}
inline void io(){
	ios_base::sync_with_stdio(false);
	cin.tie(nullptr);
	cout.tie(nullptr);
}
signed main() {
    int n, m, mx = 0;
    cin >> m >> n;
    vec<int> a(n + 1), b(n + 1), c(n + 1), dp(m + 1, -1);
    for (int i = 1; i <= n; i++)
        cin >> b[i] >> a[i] >> c[i];
    dp[0] = 0;
    auto binsearch = [&](int i, int j) {
        int l = 1, r = c[i], ans = 0;
        while (l <= r) {
            int mid = (l + r) / 2;
            if (j + a[i] * mid <= m)
				l = mid + 1 , ans = mid;
            else r = mid - 1;
        }
        return ans;
    };
    for (int i = 1; i <= n; i++) {
        for (int j = m; j >= 0; j--) {
            if (dp[j] != -1) {
                int kol = binsearch(i, j);
                if (j + a[i] * kol <= m) {
                    chmax(dp[j + a[i] * kol], dp[j] + b[i] * kol);
                    chmax(mx , dp[j + a[i] * kol]);
                }
            }
        }
    }
    cout << (mx != -1 ? mx : 0) << "\n";
    return 0;
}

• Subtask 1: 12 / 12
• Subtask 2: 17 / 17
• Subtask 3: 0 / 20
• Subtask 4: 0 / 24
• Subtask 5: 0 / 27