Submission #1003115

#	Time	Username	Problem	Language	Result	Execution time	Memory
1003115		fryingduc	Knapsack (NOI18_knapsack)	C++17	29 / 100	1 ms	448 KiB

knapsack

// #pragma GCC optimize("Ofast,unroll-loops")
#include "bits/stdc++.h"
using namespace std;

#define sz(a) ((int)(a).size())
#define all(a) (a).begin(), (a).end()

#define yes cout << "YES\n"
#define no cout << "NO\n"

#ifdef LOCAL
#define debug(val) cerr << "["#val << " = " << (val) << "] "
#define slash() cerr << "\n-----------\n"
#define time() cerr << "Time is: " << 1000 * clock()/CLOCKS_PER_SEC << " ms\n"
#else
#define debug(val) 1407
#define slash() 1407
#define time() 1407
#endif

const string filename = "";

int n, W;
vector<pair<int, int>> v;
void solve(){
    cin >> W >> n;
    int bits = 1;
    for(int i=0;i<n;i++){
        int a, b, c; cin >> b >> a >> c;
        c = min(c, W);
        bits = 1;
        while(c - bits >= 0){
            if(1ll * a * bits <= W) {
                v.push_back({a * bits, b * bits});
            }
            c -= bits;
            bits *= 2;
        }
        if(c){  
            if(1ll * c * a <= W) {
                v.push_back({c * a, c * b});
            }
        }
    }
    sort(v.begin(), v.end());
    v.erase(unique(v.begin(), v.end()), v.end());
    vector<int> dp(W+1, 0);
    for(int i=0;i< (int)v.size();i++){
        for(int j=W;j >= v[i].first;j--){
            dp[j] = max(dp[j], dp[j-v[i].first] + v[i].second);
        }
    }
    cout << dp[W];
}
signed main(){
	int test = 1;
	/* cin >> test; */
	for(int i=1;i<=test;i++){
		// cout << "Case " << "#" << i << ": ";
		solve();
	}
	return 0;
}

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