Submission #1088610

#	Time	Username	Problem	Language	Result	Execution time	Memory
1088610		shidou26	Knapsack (NOI18_knapsack)	C++14	73 / 100	14 ms	5724 KiB

knapsack

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

#define endl '\n'
#define all(v) v.begin(), v.end()

typedef long long ll;
typedef pair<int, int> ii;
typedef pair<ll, int> li;

const int N = 1e5 + 3;

int n, m;

int num = 0;
ll dp[N], wes[N], ves[N];

void prepare() {

}

void input() {
    cin >> m >> n;

    for(int i = 1; i <= n; i++) {
        int w, v, a; cin >> v >> w >> a;
        int two = 1;
        while(two <= a) {
            wes[++num] = 1LL * w * two;
            ves[num] = 1LL * v * two;
            a -= two;
            two *= 2;
        }
        if(a > 0) {
            wes[++num] = 1LL * w * a;
            ves[num] = 1LL * v * a;
        }
    }
}

void process() {
    for(int i = 1; i <= num; i++) {
        for(int j = m; j >= wes[i]; j--) {
            dp[j] = max(dp[j], dp[j - wes[i]] + ves[i]);
        }
    }
    cout << dp[m] << endl;
}

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    #define task "quantity"
    if(fopen(task".INP", "r")) {
        freopen(task".INP", "r", stdin);
        freopen(task".OUT", "w", stdout);
    }

    prepare();

    int testcase = 1; // cin >> testcase;
    for(int i = 1; i <= testcase; i++) {
        input();
        process();
    }

    return 0;
}

Compilation message (stderr)

knapsack.cpp: In function 'int main()':
knapsack.cpp:56:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   56 |         freopen(task".INP", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
knapsack.cpp:57:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   57 |         freopen(task".OUT", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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