Submission #1005657

#	Time	Username	Problem	Language	Result	Execution time	Memory
1005657		anango	Olympiads (BOI19_olympiads)	C++17	0 / 100	1 ms	348 KiB

olympiads

#include <bits/stdc++.h>
using namespace std;


vector<vector<int>> cons;

int n,k,c;
vector<int> getbest(vector<int> indices) {
    //get the best team using radix sort greedy method (the first k are the best team, rest are reserves)
    for (int i=0; i<k; i++) {
        for (int j=i+1; j<indices.size(); j++) {
            if (cons[indices[j]][i]>cons[indices[i]][i]) {
                swap(indices[i], indices[j]);
            }
        }
    }
    return indices;
}

int evaluate_combination(vector<int> indices) {
    vector<int> maxes(k,0);
    for (int i=0; i<indices.size(); i++) {
        for (int j=0; j<k; j++) {
            maxes[j]=max(maxes[j],cons[indices[i]][j]);
        }
    }
    return accumulate(maxes.begin(), maxes.end(), (int)0);
}


signed main() {
    freopen("input.txt","r", stdin);
    freopen("output.txt","w",stdout);
    cin >> n >> k >> c;

    vector<int> start;
    vector<int> totalmaxes(k,0);
    for (int i=0; i<n; i++) {
        start.push_back(i);
        vector<int> c1;
        for (int j=0; j<k; j++) {
            int x;
            cin >> x;
            c1.push_back(x);
            totalmaxes[j]=max(totalmaxes[j],x);
        }
        cons.push_back(c1);
    }
    int total = accumulate(totalmaxes.begin(), totalmaxes.end(), (int)0);
    start = getbest(start);


    priority_queue<vector<vector<int>>> current;
    current.push({{total},{0},start});
    int ct=0;
    while (ct<c) {
        ct++;
        assert(current.size()>0);
        vector<vector<int>> latest = current.top();
        current.pop();
        int value = latest[0][0];
        vector<int> indices = latest[2];
        /*cout << ct <<" " << value << " " << latest[1][0] << endl;
        cout << "INDICES ";
        for (auto j:indices) {
            cout << j <<" ";
        }
        cout << endl;*/
        if (ct==c) {
            cout << value << endl;
            return 0;
        }
        if (indices.size()==k) {
            //leaf node
            continue;
        }

        
        for (int nex=latest[1][0]; nex<k; nex++) {
            //the next optimal element being removed
            vector<int> new_indices(indices.begin(), indices.end());
            //remove this position from the team
            new_indices.erase(find(new_indices.begin(),new_indices.end(),new_indices[nex]));
            new_indices = getbest(new_indices);
            current.push({{evaluate_combination(new_indices)},{nex},new_indices});
            
        }
    }


    
    
}

Compilation message (stderr)

olympiads.cpp: In function 'std::vector<int> getbest(std::vector<int>)':
olympiads.cpp:11:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   11 |         for (int j=i+1; j<indices.size(); j++) {
      |                         ~^~~~~~~~~~~~~~~
olympiads.cpp: In function 'int evaluate_combination(std::vector<int>)':
olympiads.cpp:22:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   22 |     for (int i=0; i<indices.size(); i++) {
      |                   ~^~~~~~~~~~~~~~~
olympiads.cpp: In function 'int main()':
olympiads.cpp:73:27: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   73 |         if (indices.size()==k) {
      |             ~~~~~~~~~~~~~~^~~
olympiads.cpp:32:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   32 |     freopen("input.txt","r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
olympiads.cpp:33:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   33 |     freopen("output.txt","w",stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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