Submission #963466

#	Time	Username	Problem	Language	Result	Execution time	Memory
963466		bashNewbie	Knapsack (NOI18_knapsack)	C++17	100 / 100	57 ms	4004 KiB

knapsack

#include <iostream>
#include <vector>
#include <algorithm>
#include <cstring>
#include <utility>
using namespace std;

#define fast_io ios::sync_with_stdio(0), cin.tie(0)
#define pb push_back
#define sz(x) (int)x.size()
#define rng(x) begin(x), end(x)
template <typename T>
using vt = vector<T>;
using vi = vt<int>;
using pi = pair<int, int>;
using vp = vt<pi>;

const int N = 2e3+7;
int dp[N]; vp wt[N]; vp fin;

void add(int j, int s) {
	sort(rng(wt[j]), greater<pi>());

	int m = 0;
	for(auto [v, c]: wt[j]) {
		for(int i = 0; i < c && m+j <= s; i++, m+=j) {
			fin.pb({v, j});
		}
	}
}

void solve() {
	int s, n; cin >> s >> n;
	for(int i = 0; i < n; i++) {
		int v, w, c; cin >> v >> w >> c;
		wt[w].pb({v, c});
	}
	for(int j = 0; j <= s; j++) add(j, s);

	memset(dp, 0xff, sizeof(dp)); dp[0] = 0;
	
	int ret = 0;
	for(auto [v, w]: fin) {
		for(int j = s, k = s-w; ~k; j--, k--) {
			if(~dp[k]) dp[j] = max(dp[j], dp[k]+v), ret = max(ret, dp[j]);
		}
	}
	cout << ret << "\n";
}

int main() {
	fast_io;

	solve();
}

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