Submission #1097875

#	Time	Username	Problem	Language	Result	Execution time	Memory
1097875		Art	Knapsack (NOI18_knapsack)	C++17	100 / 100	763 ms	8400 KiB

knapsack

// |Art| - Bùi Hải Đăng K65
// 

#pragma GCC optimize("02,unroll-loops")
// #pragma GCC target("avx2,fma")

#include <bits/stdc++.h>

#define fi              first
#define se              second
#define el              cout << '\n'

#define sz(x)           (x).size()
#define all(v)          (v).begin(), (v).end()
#define debug(val)      cout << "["#val" = " << (val) << "] "

#define FOR(i, a, b)    for (int i = (a), _b = (b); i <= _b; ++i)
#define REV(i, b, a)    for (int i = (b), _a = (a); i >= _a; --i)
#define REP(i, n)       for (int i = 0, _n = (n); i < _n; ++i)

#define __Art__         main(void)

const int N = 2e3 + 10;

using namespace std;

int s, n;
vector<int> w;
vector<int> v;

void prepare() {
    cin >> s >> n;

    w.push_back(0);
    v.push_back(0);

    FOR (i, 1, n) {
        int weg, val, num; 
        cin >> val >> weg >> num;

        int pow2 = 1;
        bool check = 1;
        while(num >= pow2) {
            if (weg > s / pow2) {
                check = 0;
                break;
            }
            w.push_back(weg * pow2);
            v.push_back(val * pow2);
            num -= pow2; pow2 *= 2;
        }

        if(num > 0 && check) {
            w.push_back(weg * num);
            v.push_back(val * num);
        }
    }
}

// ---------------------------- //

long long f[N];

// ---------------------------- //

void solve() {
    FOR (i, 1, sz(w) - 1) REV (j, s, w[i]) {
        f[j] = max(f[j], f[j - w[i]] + v[i]);
    }

    cout << f[s];
}

__Art__ {

    ios_base::sync_with_stdio(false); 
    cin.tie(nullptr); cout.tie(nullptr);

    #define name "art"
    if (fopen(name".inp", "r")) {
        freopen(name".inp", "r", stdin);
        freopen(name".out", "w", stdout);
    }

    int numtest = 1;
    // cin >> numtest;
    while (numtest--) {
        prepare();
        {solve(); continue;}
    }

    // cerr << "\nTime elapsed: " << 1.0 * clock() / CLOCKS_PER_SEC << "s\n";

    return 0;
}

Compilation message (stderr)

knapsack.cpp:22:25: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   22 | #define __Art__         main(void)
      |                         ^~~~
knapsack.cpp:75:1: note: in expansion of macro '__Art__'
   75 | __Art__ {
      | ^~~~~~~
knapsack.cpp: In function 'int main()':
knapsack.cpp:82:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   82 |         freopen(name".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
knapsack.cpp:83:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   83 |         freopen(name".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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