Submission #1271600

#	Time	Username	Problem	Language	Result	Execution time	Memory
1271600		annn	Knapsack (NOI18_knapsack)	C++20	100 / 100	37 ms	3804 KiB

knapsack

#include <bits/stdc++.h>
using namespace std;

#define ll long long
#define endl "\n"
#define pb push_back
#define ff first
#define ss second
#define ii pair<int, int>
#define vi vector<int>
#define vii vector<pair<int, int>>
#define yes cout << "YES\n"
#define no cout << "NO\n"
#define mii map<int, int>
#define rep(i, a, b) for (int i = a; i <= b; i++)
#define all(a, len) (a) + 1, (a) + len + 1
#define vall(a) (a).begin(), a.end()
#define _READ(name) freopen(name, "r", stdin)
#define _WRITE(name) freopen(name, "w", stdout)
const int INF = 4e18;
const int MOD = 1e9 + 7;

int n, w; const int mx = 1e6 + 3, mxw = 2003;
int k[mx], a[mx], b[mx];
vector<int> val[mxw];
vii wei[mxw];
ll dp[mxw];
void Prepare() {
    cin >> w >> n;
    rep(i, 1, n) {
    	cin >> b[i] >> a[i] >> k[i];
    	wei[a[i]].pb({b[i], k[i]});
    }
}

void COOOOK() {
	for (int e = 1; e <= w; e++) {
		priority_queue<ii> pq;
		for (auto it: wei[e]) pq.push(it);
		
		for (int _ = 1; _ <= w/e && pq.size(); _++) {
			ii ff = pq.top(); pq.pop();
			val[e].pb(ff.ff);
			if (ff.ss >= 2) pq.push({ff.ff, ff.ss - 1});
		}
	}
	
	// dp[i] = max val voi khoi luong toi da = i
	
	for (int i = 1; i <= w; i++) {
		for (auto it: val[i]) {
			for (int j = w; j >= i; j--) {
				dp[j] = max(dp[j], dp[j-i]*1ll + it*1ll);
			}
		}
	}
	cout << *max_element(dp+1, dp+w+1);
}

void Eat() {

}

void Wash() {

}

signed main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr); cout.tie(nullptr);

    int TEST = 1;
    // cin >> TEST;
    while (TEST--) {
        Prepare();
        COOOOK();
        Eat();
        Wash();
    }

    return 0;

}

Compilation message (stderr)

knapsack.cpp:20:17: warning: overflow in conversion from 'double' to 'int' changes value from '4.0e+18' to '2147483647' [-Woverflow]
   20 | const int INF = 4e18;
      |                 ^~~~

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