Submission #464295

#	Time	Username	Problem	Language	Result	Execution time	Memory
464295		vbee	Knapsack (NOI18_knapsack)	C++14	100 / 100	71 ms	4820 KiB

knapsack

#include <bits/stdc++.h>
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define ii pair<int,int>
#define vii vector<ii>
#define vi vector<int>
#define fi first
#define se second
#define TASK ""
#define ll long long
#define pll pair<ll, ll>
#define vll vector<ll>
#define vpll vector<pll>
#define pb push_back
#define MASK(i) (1 << (i))
#define BIT(x, i) ((x >> (i)) & 1)

using namespace std;

const int oo = 1e9 + 7;
const ll loo = (ll)1e18 + 7;
const int N = 1e5 + 1;
const int S = 2007;
int dp[S], w[N], v[N], k[N], n, s;
void maximize(int &a, int b){
	if (a < b) a = b;
}
vii obj[S];
int main() {
	scanf("%d%d", &s, &n);
	for (int i = 1; i <= n; i++) {
		scanf("%d%d%d", &v[i], &w[i], &k[i]);
		obj[w[i]].pb({v[i], k[i]});
	}
	for (int i = 0; i <= s; i++){
		if (obj[i].size() == 0) continue;
		sort(all(obj[i]), greater<ii>());
		int id = 0;
		for (int j = 0; j * i < s; j++){
			if (id >= obj[i].size()) break;
			for (int k = s; k >= i; k--){
				maximize(dp[k], dp[k - i] + obj[i][id].fi);
			}
			if (--obj[i][id].se == 0) id++;
		}
	}
	cout << dp[s];
	return 0;
}

Compilation message (stderr)

knapsack.cpp: In function 'int main()':
knapsack.cpp:40:11: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   40 |    if (id >= obj[i].size()) break;
      |        ~~~^~~~~~~~~~~~~~~~
knapsack.cpp:30:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   30 |  scanf("%d%d", &s, &n);
      |  ~~~~~^~~~~~~~~~~~~~~~
knapsack.cpp:32:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   32 |   scanf("%d%d%d", &v[i], &w[i], &k[i]);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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