제출 #683383

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
683383		vjudge1	Knapsack (NOI18_knapsack)	C++17	73 / 100	1083 ms	1332 KiB

knapsack

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

#define ll long long
#define ull unsigned long long
#define ed '\n'
#define pb push_back
#define int long long
#define ii pair<int,int>
#define o_set tree<int, null_type,less<int>, rb_tree_tag,tree_order_statistics_node_update>
#define fi first
#define se second

using namespace __gnu_pbds;
using namespace std;

int dp[2005];

void solve() {
    int s, n;
    cin >> s >> n;

    while(n--) {
        int v, w, cnt;
        cin >> v >> w >> cnt;
        int tmp = 1;
        while(cnt) {
            int cv = v * min(tmp, cnt);
            int cw = w * min(tmp, cnt);

            for(int i = s; i >= cw; --i) {
                dp[i] = max(dp[i], dp[i - cw] + cv);
            }

            cnt -= min(tmp, cnt);
            tmp *= 2;
        }
    }
    cout << dp[s];
}

signed main() {
    ios_base::sync_with_stdio(0); cin.tie(0);
    if (fopen("cf.inp", "r")) {
        freopen("cf.inp", "r", stdin);
        //freopen("cf.inp", "w", stdout);
    }
    solve();
    return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

knapsack.cpp: In function 'int main()':
knapsack.cpp:46:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   46 |         freopen("cf.inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~

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