Submission #672673

#	Time	Username	Problem	Language	Result	Execution time	Memory
672673		tbzard	Carnival Tickets (IOI20_tickets)	C++14	27 / 100	588 ms	73040 KiB

tickets

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

void allocate_tickets(vector<vector<int> > s);
long long find_maximum(int k, vector<vector<int> > x){
    int n = x.size(), m = x[0].size();

    vector<vector<int> > s(n);
    for(int i=0;i<n;i++) s[i].resize(m);

    long long ans = -1;
    vector<int> hi;
    int idx = -1;
    vector<pair<pair<int, int>, int> > y;
    for(int i=0;i<n;i++){
        y.push_back(make_pair(make_pair(x[i][0], x[i][m-1]), i));
    }
    sort(y.begin(), y.end());
    for(int i=n/2-1;i<y.size();i++){
        int val = y[i].first.first;
        long long res = 0;

        int rem = i-(n/2-1);
        vector<pair<int, int> > best;
        for(int j=0;j<i;j++){
            res += val-y[j].first.first;
            best.push_back(make_pair((y[j].first.second-val)-(val-y[j].first.first), y[j].second));
        }
        sort(best.begin(), best.end());
        reverse(best.begin(), best.end());

        vector<int> hii;
        for(int j=0;j<rem;j++){
            res += best[j].first;
            hii.push_back(best[j].second);
        }
        for(int j=i+1;j<n;j++){
            res += y[j].first.second - val;
            hii.push_back(y[j].second);
        }
        if(ans < res){
            ans = res;
            hi = hii;
            idx = i;
        }
    }
    for(int i=0;i<n;i++){
        for(int j=0;j<m;j++){
            s[i][j] = -1;
        }
    }
    for(int i=0;i<n/2;i++){
        s[hi[i]][m-1] = 0;
    }
    for(int i=0;i<n;i++){
        if(s[i][m-1] == -1) s[i][0] = 0;
    }

    allocate_tickets(s);
    return ans;
}

Compilation message (stderr)

tickets.cpp: In function 'long long int find_maximum(int, std::vector<std::vector<int> >)':
tickets.cpp:19:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<std::pair<int, int>, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   19 |     for(int i=n/2-1;i<y.size();i++){
      |                     ~^~~~~~~~~
tickets.cpp:13:9: warning: variable 'idx' set but not used [-Wunused-but-set-variable]
   13 |     int idx = -1;
      |         ^~~

• Subtask 1: 11 / 11
• Subtask 2: 16 / 16
• Subtask 3: 0 / 14
• Subtask 4: 0 / 14
• Subtask 5: 0 / 12
• Subtask 6: 0 / 23
• Subtask 7: 0 / 10