Submission #1069049

#	Time	Username	Problem	Language	Result	Execution time	Memory
1069049		vjudge1	Knapsack (NOI18_knapsack)	C++17	0 / 100	15 ms	460 KiB

knapsack

#include <bits/stdc++.h>
#define int long long
using namespace std;
#define f first
#define s second
typedef pair<int,int> pii;
typedef tuple<int, int, int> iii;
int mod = (int)1e9 + 7; 
int  lt(int l, int r, function<bool(int x)> f)
{
    l--;
    while(l < r)
    {
        int m = l + (r - l + 1) / 2;
        if(f(m)) r = m;
        else l = m + 1;
    }
    return l;
}
int pw(int a, int b)
{
    int ans = 1;
    while(b > 0)
    {
        if(b & 1) ans *= a;
        ans %= mod;
        a *= a;
        a %= mod;
        b >>= 1;
    }
    return ans;
}
int inverse(int x)
{
    return pw(x, mod - 2); 
}
void solve()
{
    int s, n; cin >> s >> n;
    int dp[s + 1] = {0};
    bool pro[s + 1] = {false};
    pro[0] = true;
    int last = 0;
    for(int x = 0; x < n; x++)
    {
        int v, w, k; cin >> v >> w >> k;
        for(int y = 1; y <= k; y++)
        {
            if(w*y + last > s) break;
            pro[w*y + last] = true;
            dp[w*y + last] = dp[last] + v*y;
        }
        for(int z = s; z >= 0; z--)
        {
            while(w*k > z) k--;
            if(pro[z - w*k]) {
                pro[z] = true;
                last = max(last, z);
            }
            dp[z] = max(dp[z], dp[z - w*k] + v*k);
        }
        /*for(int y = 1; y <= k; y++)
        {
            for(int z = s; z >= 0; z--)
            {
                if(z - w < 0) continue;
                dp[z] = max(dp[z], dp[z - w] + v);
                mx = max(mx, dp[z]);
            }
            //cout << mx << " ";
        }*/
    }
    int mx = 0;
    for(int x = 0; x < s; x++)
    {
        if(pro[x]) mx = max(mx, dp[x]);
    }
    cout << mx;
}
signed main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0), cout.tie(0);
	//freopen("wormsort.in", "r", stdin);
	//freopen("wormsort.out", "w", stdout);
    int t = 1;
    //cin >> t;
    while(t--)
    {
        solve();
    }
    return 0;
}

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