Submission #1060878

#	Time	Username	Problem	Language	Result	Execution time	Memory
1060878		trandangquang	Knapsack (NOI18_knapsack)	C++14	0 / 100	1 ms	600 KiB

knapsack

#include <bits/stdc++.h>

using namespace std;

#define task "p1"
#define FOR(i, a, b) for(int i = (a); i <= (b); ++i)
#define FORD(i, a, b) for(int i = (a); i >= (b); --i)
#define sz(a) (int)(a).size()
#define all(a) (a).begin(), (a).end()
#define bit(s, i) (((s) >> (i)) & 1)
#define ii pair <int, int>
#define vii vector <ii>
#define vi vector <int>
#define fi first
#define se second
#define ll long long
#define eb emplace_back
#define pb push_back
#define __builtin_popcount __builtin_popcountll

void solve();

int32_t main() {
    if(fopen(task".inp", "r")) {
		freopen(task".inp", "r", stdin);
		freopen(task".out", "w", stdout);
	}
	cin.tie(0)->sync_with_stdio(0);

    int tc = 1; // cin >> tc;
    FOR(i, 1, tc) {
        solve();
    }
}

const int N = 1e5+5;

int n, m, dp[N];
vii item;

void solve() {
    cin >> n >> m;
    FOR(i, 1, n) {
        int w, v, num; cin >> w >> v >> num;

        FOR(b, 0, 10) {
            int t = (1<<b);
            if(num >= t) {
                num -= t;

                int nww = t*w, nwv = t*v;
                item.eb(nww, nwv);
            }
        }

        int rest = min(num, m/w);
        item.eb(rest*w, rest*v);
    }

    FOR(i, 0, sz(item)-1) {
        int w = item[i].fi, v = item[i].se;
        FORD(j, m, w) {
            dp[j] = max(dp[j], dp[j-w] + v);
        }
    }

    cout << dp[m];
}

Compilation message (stderr)

knapsack.cpp: In function 'int32_t main()':
knapsack.cpp:25:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   25 |   freopen(task".inp", "r", stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
knapsack.cpp:26:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   26 |   freopen(task".out", "w", stdout);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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