Submission #1040048

#	Time	Username	Problem	Language	Result	Execution time	Memory
1040048		Kipras	Boxes with souvenirs (IOI15_boxes)	C++17	20 / 100	1 ms	440 KiB

boxes

#include "boxes.h"
#include <bits/stdc++.h>

typedef long long ll;

using namespace std;

ll delivery(int n, int k, int l, int pos[]){

    ll mid = (l+1)/2;

    vector<ll> dp1, dp2;
    dp1.push_back(0);
    dp2.push_back(0);

    for(int i = 0; i < n && pos[i]<=mid; i++){
        if(i==0){
            dp1.push_back(pos[i]*2);
            continue;
        }
        if(i%k!=0)dp1.push_back(dp1.back()+2*abs(pos[i]-pos[i-1]));
        else dp1.push_back(dp1.back()+(2*pos[i]));
    }


    for(int x = n-1; x >= 0 && pos[x]>=mid; x--){
        if(x==n-1){
            dp2.push_back((l-pos[x])*2);
            continue;
        }
        ll ind = x-n+1;
        if(ind%k!=0)dp2.push_back(dp2.back()+2*abs(pos[x]-pos[x+1]));
        else dp2.push_back(dp2.back()+2*(l-pos[x]));
    }
    /*cout<<dp1.size()<<" 1, "<<dp2.size()<<" 2: \n";
    for(auto i : dp1)cout<<i<<" ";
    cout<<"\n";
    for(auto i : dp2)cout<<i<<" ";
    cout<<"\n";*/

    ll rez = 1e18;

    for(int i = 0; i < dp1.size(); i++){
        if(dp2.size()>n-i)rez=min(rez, dp1[i] + dp2[n-i]);
        if(dp2.size()>n-i-k&&n-i-k>=0)rez=min(rez, dp1[i] + dp2[n-i-k] + l);
    }


    return rez;

}

Compilation message (stderr)

boxes.cpp: In function 'll delivery(int, int, int, int*)':
boxes.cpp:43:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   43 |     for(int i = 0; i < dp1.size(); i++){
      |                    ~~^~~~~~~~~~~~
boxes.cpp:44:22: warning: comparison of integer expressions of different signedness: 'std::vector<long long int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   44 |         if(dp2.size()>n-i)rez=min(rez, dp1[i] + dp2[n-i]);
      |            ~~~~~~~~~~^~~~
boxes.cpp:45:22: warning: comparison of integer expressions of different signedness: 'std::vector<long long int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   45 |         if(dp2.size()>n-i-k&&n-i-k>=0)rez=min(rez, dp1[i] + dp2[n-i-k] + l);
      |            ~~~~~~~~~~^~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 0 / 15
• Subtask 4: 0 / 15
• Subtask 5: 0 / 20
• Subtask 6: 0 / 30