Submission #942164

#	Time	Username	Problem	Language	Result	Execution time	Memory
942164		phoenix0423	Olympiads (BOI19_olympiads)	C++17	44 / 100	909 ms	262144 KiB

olympiads

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<ll, ll> pll;
#define fastio ios::sync_with_stdio(false), cin.tie(0)
#pragma GCC optimize("Ofast")
#define pb push_back
#define eb emplace_back
#define f first
#define s second
#define int long long
#define lowbit(x) x&-x
const int maxn = 1e5 + 5;
const int INF = 1e9 + 7;
int a[505][10];
int n, k, c;

struct info{
    set<int> idx;
    int ans;
    info(){}
    info(set<int> _idx, int _ans) : idx(_idx), ans(_ans){}
    bool operator < (const info& other) const{
        return ans < other.ans;
    }
};
set<set<int>> used;
int cal(set<int> id){
    vector<int> mx(k);
    for(auto x : id){
        for(int i = 0; i < k; i++){
            mx[i] = max(mx[i], a[x][i]);
        }
    }
    return accumulate(mx.begin(), mx.end(), 0);
}

signed main(void){
    fastio;
    cin>>n>>k>>c;
    vector<int> mx(k);
    for(int i = 0; i < n; i++){
        for(int j = 0; j < k; j++){
            cin>>a[i][j];
            if(a[i][j] > a[mx[j]][j]) mx[j] = i;
        }
    }
    set<int> st;
    for(int i = 0; i < k; i++) st.insert(mx[i]);
    for(int i = 0; i < n; i++){
        if(st.size() == k) break;
        if(st.count(i)) continue;
        st.insert(i);
    }
    used.insert(st);
    priority_queue<info> q;
    q.push(info(st, cal(st)));
    for(int rd = 0; rd < c; rd++){
        auto [idx, ans] = q.top(); q.pop();
        if(rd == c - 1){
            cout<<ans<<"\n";
            return 0;
        }
        for(auto x : idx){
            set<int> cur;
            for(auto u : idx){
                if(u != x) cur.insert(u);
            }
            for(int j = 0; j < n; j++){
                if(!cur.count(j)){
                    cur.insert(j);
                    if(!used.count(cur)){
                        q.push(info(cur, cal(cur)));
                        used.insert(cur);
                    }
                    cur.erase(j);
                }
            }
        }
    }
}

Compilation message (stderr)

olympiads.cpp: In function 'int main()':
olympiads.cpp:51:22: warning: comparison of integer expressions of different signedness: 'std::set<long long int>::size_type' {aka 'long unsigned int'} and 'long long int' [-Wsign-compare]
   51 |         if(st.size() == k) break;
      |            ~~~~~~~~~~^~~~

• Subtask 1: 13 / 13
• Subtask 2: 31 / 31
• Subtask 3: 0 / 24
• Subtask 4: 0 / 32