Submission #1319328

#	Time	Username	Problem	Language	Result	Execution time	Memory
1319328		quan123	Knapsack (NOI18_knapsack)	C++20	73 / 100	1095 ms	456 KiB

knapsack

#include <bits/stdc++.h>
#define int long long

using namespace std;

template<typename T, typename... Args>
void print(T t) {cout << t << '\n';}
template<typename T, typename... Args>
void print(T t, Args... args) {cout << t << " "; print(args...) ;}

const int S = 2005 , MX = 1e9+7;

int dp[S];
int n , s , ans = -MX;

void file_input() {
    if (fopen("inp.txt" , "r")) {
        freopen("inp.txt" , "r" , stdin);
        freopen("out.txt" , "w" , stdout);
    }
}

signed main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    file_input();
    for (int i = 1; i < S; i++) {dp[i] = -1;}
    cin >> s >> n;
    while (n--) {
        int a , b , k;
        cin >> a >> b >> k;
        vector<int> l;
        int sm = k;
        for (int p = 0; (k>>p) != 1; p++) {
            l.push_back(1<<p);
            sm -= (1<<p);
        }
        l.push_back(sm);
        for (int i : l) {
            int v = a*i , w = b*i;
            for (int p = s-w; p >= 0; p--) {
                if (dp[p] == -1) {continue;}
                dp[p+w] = max(dp[p+w] , dp[p]+v);
            }
        }
    }
    for (int p = 0; p <= s; p++) {ans = max(ans , dp[p]);}
    cout << ans;
    return 0;
}

Compilation message (stderr)

knapsack.cpp: In function 'void file_input()':
knapsack.cpp:18:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   18 |         freopen("inp.txt" , "r" , stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
knapsack.cpp:19:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   19 |         freopen("out.txt" , "w" , stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

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