제출 #751747

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
751747		VMaksimoski008	Knapsack (NOI18_knapsack)	C++14	0 / 100	1 ms	212 KiB

knapsack

#include <bits/stdc++.h>
#define sz(x) (int)(x).size()
using ll = long long;
using ull = unsigned long long;
const int mod = 1e9 + 7;
const int maxn = 1e6;
using namespace std;

void setUSA(string name)
{
    string inName = name + ".in";
    string outName = name + ".out";
    freopen(inName.c_str(), "r", stdin);
    freopen(outName.c_str(), "w", stdout);
}

void setIO(string name = "")
{
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);
    if(name != "") setUSA(name);
}

struct Product
{
    int val;
    int weight;
    int copies;
};

int main()
{
    setIO();

    int s, n;
    cin >> s >> n;
    vector<Product> v(n);
    for(Product &p : v) cin >> p.val >> p.weight >> p.copies;

    if(n == 1) {
        int w = v[0].weight;
        int c = v[0].copies;
        int vr = v[0].val;
        if(w*c <= s) cout << vr*c << '\n';
        else cout << vr * min(s / w, c) << '\n';
        return 0;
    }

    return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

knapsack.cpp: In function 'void setUSA(std::string)':
knapsack.cpp:13:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   13 |     freopen(inName.c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
knapsack.cpp:14:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   14 |     freopen(outName.c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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