제출 #1192813

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1192813		GoBananas69	Knapsack (NOI18_knapsack)	C++20	컴파일 에러	0 ms	0 KiB

knapsack

#include <algorithm>
#include <iostream>
#include <vector>
using namespace std;
typedef long long ll;

void fastscan(int &number) {
    bool negative = false;
    register int c;

    number = 0;

    c = getchar();
    if (c == '-') {
        negative = true;
        c = getchar();
    }
    for (; (c > 47 && c < 58); c = _getchar_nolock()) number = number * 10 + c - 48;
    if (negative) number *= -1;
}

int main() {
    cin.tie(0)->sync_with_stdio(0);
    int s, n;
    fastscan(s);
	fastscan(n);
    if (s < 0 || n <= 0) {
        cout << 0 << '\n';
        return 0;
    }
    vector<ll> v(1, 0), w(1, 0);

    for (int i = 0; i < n; ++i) {
        int price, weight, count;
        fastscan(price);
		fastscan(weight);
		fastscan(count);
        int y = s / weight;
        count = min(y, count);
        int k = 1;
        while (k <= count) {
            w.push_back(weight * k);
            v.push_back(price * k);
            count -= k;
            k *= 2;
        }
        if (count > 0) {
            w.push_back(weight * count);
            v.push_back(price * count);
        }
    }
    n = v.size() - 1;
    if (n == 0) {
        cout << 0 << '\n';
        return 0;
    }
    vector<vector<ll>> dp(2, vector<ll>(s + 1, 0));
    for (int i = 1; i <= n; ++i) {
        for (int j = 0; j <= s; ++j) {
            if (w[i] > j) {
                dp[1][j] = dp[0][j];
            } else {
                dp[1][j] = max(dp[0][j], v[i] + dp[0][j - w[i]]);
            }
        }
        swap(dp[1], dp[0]);
    }
    cout << dp[0][s] << '\n';
}

컴파일 시 표준 에러 (stderr) 메시지

knapsack.cpp: In function 'void fastscan(int&)':
knapsack.cpp:9:18: warning: ISO C++17 does not allow 'register' storage class specifier [-Wregister]
    9 |     register int c;
      |                  ^
knapsack.cpp:18:36: error: '_getchar_nolock' was not declared in this scope; did you mean 'getchar_unlocked'?
   18 |     for (; (c > 47 && c < 58); c = _getchar_nolock()) number = number * 10 + c - 48;
      |                                    ^~~~~~~~~~~~~~~
      |                                    getchar_unlocked