Submission #1065906

#	Time	Username	Problem	Language	Result	Execution time	Memory
1065906		chaoslong	Knapsack (NOI18_knapsack)	C++14	29 / 100	2 ms	604 KiB

knapsack

// Calm down.
// Think three times, code twice.
#include "bits/stdc++.h"
#define forr(_a,_b,_c) for(int _a = (_b); _a <= (_c); ++_a)
#define ford(_a,_b,_c) for(int _a = (_b) + 1; _a --> (_c);)
#define forf(_a,_b,_c) for(int _a = (_b); _a < (_c); ++_a)
#define st first
#define nd second
#define ll long long
#define ull unsigned long long
#define pii pair <int,int>
#define pll pair <ll,ll>
#define piii pair <int,pii>
#define vi vector <int>
#define pb push_back
#define mp make_pair
#define all(x) begin(x),end(x)
#define mask(i) (1LL << (i))
#define bit(x, i) (((x) >> (i)) & 1)
#define bp __builtin_popcountll
#define file "test"

using namespace std;
const int N = 2e5 + 5;
const int mod = 1e9 + 7; // 998244353
const ll oo = 1e18;

vector<pll> a[2005];
ll s, n, dp[2005];

void to_nho_cau() {
    cin >> s >> n;
    forr(i, 1, n) {
        ll v, w, k; cin >> v >> w >> k;
        a[w].pb({v, k});
    }
    forr(i, 1, s) {
        if(a[i].size())
        sort(all(a[i]), greater<>());
    }
    forr(i, 1, s) {
        if(a[i].empty()) continue;
        ford(j, s, 1) {
            ll cur = 0, cur_val = 0, sl = 0;
            forr(k, 0, a[i].size()-1) {
                int tmp = min((j - cur) / i, a[i][k].nd);
                cur_val += tmp * a[i][k].st;
                cur += tmp * i;
                sl += a[i][k].nd;
//                cout << i << " " << j << " " << cur << " " << cur_val << "\n";
                dp[j] = max(dp[j], dp[j - cur] + cur_val);
                if(sl > j / i) break;
            }
        }
    }
    ll ans = 0;
    forr(i, 1, s) ans = max(ans, dp[i]);
    cout << ans << "\n";
}

signed main(){
    ios_base::sync_with_stdio(0);cin.tie(0);
    #ifdef LOCAL
        freopen(file".inp","r",stdin);
        freopen(file".out","w",stdout);
    #endif
    int t = 1;
    //cin >> t;
    while(t--) to_nho_cau();
}
/*
1.self check:
2.long long
3.size of array
4.code for testing
5.initializing
6.modulo number
*/
/**
  ∧__∧
（｀•ω• )づ__∧
（つ　 /( •ω•。)
  しーＪ (nnノ) pat pat
**/
/**  /\_/\
*   (= ._.)
*   / >☕ \>💻
**/
/**
･*･  ∧,,∧ ∧_∧   ･*･
'.　 ( ｡･ω･)(･ω･｡ )　  .'
　'･ |   つ♥と    |.･'
      *'***** '*
**/

Compilation message (stderr)

knapsack.cpp:85:9: warning: "/*" within comment [-Wcomment]
   85 | /**  /\_/\
      |          
knapsack.cpp: In function 'void to_nho_cau()':
knapsack.cpp:4:46: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    4 | #define forr(_a,_b,_c) for(int _a = (_b); _a <= (_c); ++_a)
      |                                              ^
knapsack.cpp:45:13: note: in expansion of macro 'forr'
   45 |             forr(k, 0, a[i].size()-1) {
      |             ^~~~

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