Submission #970453

#	Time	Username	Problem	Language	Result	Execution time	Memory
970453		jadai007	Knapsack (NOI18_knapsack)	C++14	100 / 100	325 ms	6408 KiB

knapsack

#include <bits/stdc++.h>
#define ll long long
#define ti tuple<int, int, int>

using namespace std;
 
int s, n, k, v, w, cw, cv;
ll dp[2010], ans;
ti arr[1000010];
priority_queue<int, vector<int>, greater<int>> pq[2010];
vector<pair<int, int>> item;
 
int main() {
    cin.tie(0)->sync_with_stdio(0);
    cin >> s >> n;
    for(int i=0; i<n; i++) {
        cin >> v >> w >> k;
        arr[i] = {v, w, k};
    }
    sort(arr, arr+n, greater<ti>());
    for(int i=0; i<n; i++) {
        v = get<0>(arr[i]);
        w = get<1>(arr[i]);
        k = get<2>(arr[i]);
        k = min(k, s/w);
        while(k--) {
            pq[w].push(v);
            if(pq[w].size() > s/w) break;
        }
    }
    for(int i=1; i<=s; i++) {
        while(!pq[i].empty()) {
            item.push_back({i, pq[i].top()});
            pq[i].pop();
        }
    }
    for(auto i: item) {
        cw = i.first;
        cv = i.second;
        for(int j=s; j>=0; j--) {
            if(dp[j] == 0 && j != 0) continue;
            if(cw + j <= s) dp[cw+j] = max(dp[cw+j], dp[j]+cv);
        }
    }
    for(int i=0; i<=s; i++) ans = max(ans, dp[i]);
    cout << ans;
    return 0;
}

Compilation message (stderr)

knapsack.cpp: In function 'int main()':
knapsack.cpp:28:29: warning: comparison of integer expressions of different signedness: 'std::priority_queue<int, std::vector<int>, std::greater<int> >::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   28 |             if(pq[w].size() > s/w) break;
      |                ~~~~~~~~~~~~~^~~~~

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