Submission #431324

#	Time	Username	Problem	Language	Result	Execution time	Memory
431324		A_D	Carnival Tickets (IOI20_tickets)	C++14	27 / 100	736 ms	126752 KiB

tickets

#include "tickets.h"
#include <bits/stdc++.h>
#define ll long long
#define ii pair<ll,ll>
#define F first
#define S second
using namespace std;
const int NN=1520;
ii a[NN];
ii b[NN];
pair<long long,ii> dp[NN][NN];
long long ans=0;
long long find_maximum(int k,vector<vector<int>>x){
    int n=x.size();
    int m=x[0].size();
//    cout<<endl;
    for(int j=0;j<n;j++){
        a[j]={1e9,1e9};
        b[j]={0,0};
            for(int i=0;i<m;i++){
            a[j]=min(a[j],{x[j][i],i});
            b[j]=max(b[j],{x[j][i],i});
        }
  //      cout<<a[j].F<<" "<<b[j].F<<endl;
    }
    //cout<<endl;
    for(int i=0;i<=n;i++){
        for(int j=0;j<=n;j++){
            dp[i][j].first=-1e18;
        }
    }
    vector<vector<int>> ann;
    vector<int> vec;
    for(int i=0;i<x[0].size();i++){
        vec.push_back(-1);
    }
    for(int i=0;i<x.size();i++)ann.push_back(vec);
    vec.clear();
    dp[0][0]={-a[0].F,{0,a[0].S}};
    dp[0][1]={+b[0].F,{0,b[0].S}};
    for(int i=0;i<n-1;i++){
        for(int j=0;j<n-1;j++){
            dp[i+1][j]=max(dp[i+1][j],{dp[i][j].F-a[i+1].F,{j,a[i+1].S}});
            dp[i+1][j+1]=max(dp[i+1][j+1],{dp[i][j].F+b[i+1].F,{j,b[i+1].S}});
        }
    }
    /*
    cout<<endl;
    for(int i=0;i<n;i++){
        for(int j=0;j<n;j++){
            cout<<dp[i][j].F<<" ";
        }
        cout<<endl;
    }
    cout<<endl;
    */
    ans=dp[n-1][n/2].F;
    int idx=n-1,me=n/2;
    while(idx>=0){
        ann[idx][dp[idx][me].S.S]=0;
        me=dp[idx][me].S.F;
        idx--;
    }
    allocate_tickets(ann);
    return ans;
}

Compilation message (stderr)

tickets.cpp: In function 'long long int find_maximum(int, std::vector<std::vector<int> >)':
tickets.cpp:34:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   34 |     for(int i=0;i<x[0].size();i++){
      |                 ~^~~~~~~~~~~~
tickets.cpp:37:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   37 |     for(int i=0;i<x.size();i++)ann.push_back(vec);
      |                 ~^~~~~~~~~

• 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