Submission #1036241

#	Time	Username	Problem	Language	Result	Execution time	Memory
1036241		sh1ro	Knapsack (NOI18_knapsack)	C++14	0 / 100	136 ms	262144 KiB

knapsack

#include <bits/stdc++.h>
#define int long long
#define endl '\n'
using namespace std;
const int N = 1e5 + 4;
const int oo = 1e18;
const int mod = 1e9 + 7;
int t, n, q, m, k, a[N], ans, dp[N][2005], w, cnt, cur, dem, coun, profit;
map<int, vector<pair<int, int>>>mp;
vector<pair<int, int>>v;
bool cmp(pair<int, int>a, pair<int, int>b){
    return a.first > b.first;
}
void solve(){
    cnt = 1;
    cin >> k >> n;
    for (int i = 1; i <= n; i++){
        int x, y, z; cin >> x >> y >> z;
        if (y <= k)mp[y].push_back({x, z});
    }
    memset(dp, -1, sizeof(dp));
    dp[0][0] = 0;
    for (auto p : mp){
        w = p.first, v = p.second;
        sort(v.begin(), v.end(), cmp);
        for (int i = 0; i <= k; i++){
            dem = coun = 0, cur = 1;
            dp[cnt][i] = dp[cnt - 1][i];
            profit = 0;
            while (cur * w <= i && dem < v.size()){
                profit += v[dem].first;
                if (dp[cnt - 1][i - cur * w] != -1)dp[cnt][i] = max(dp[cnt][i], dp[cnt - 1][i - cur * w] + profit);
                cur++;
                coun++;
                if (coun == v[dem].second){
                    coun = 0;
                    dem++;
                }
            }
        }
        cnt++;
    }
    for (int i = 0; i <= n; i++){
        for (int j = 0; j <= k; j++)ans = max(ans, dp[i][j]);
    }
    cout << ans;
}
main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    //freopen("clocktree.in", "r", stdin); freopen("clocktree.out", "w", stdout);
    t = 1;
    //cin >> t;
    while (t--)solve();
    return 0;
}

Compilation message (stderr)

knapsack.cpp: In function 'void solve()':
knapsack.cpp:30:40: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   30 |             while (cur * w <= i && dem < v.size()){
      |                                    ~~~~^~~~~~~~~~
knapsack.cpp: At global scope:
knapsack.cpp:48:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   48 | main() {
      | ^~~~

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