Submission #416026

#	Time	Username	Problem	Language	Result	Execution time	Memory
416026		victoriad	Boxes with souvenirs (IOI15_boxes)	C++14	35 / 100	2 ms	204 KiB

boxes

#include "boxes.h"
#include <vector>
 
using namespace std;
 
int n,n2;
long long int dfs(bool b,int K,int box[],long long int L,int N,int tk){
    long long int m=1e12,j=1e12;
for(int i=0;i<N;i++){
    if(box[i]!=-1){
    int x=box[i];
    if(1<=K){
    K--;
    if(x<=L/2)b=false;
    if(x<=L/2)m=x;
    else if(j==1e12){
        j=x;
        if(2*m+2*(L-j)<=L){
            return 2*m;
        }
    }
     n--;
    box[i]=-1;
    }
    if(K==0||n==0){
    if((x<=L/2))return 2*x;
    else if(b){
         return 2*(L-j);
    }
    else{
        return min(L,2*(L-j)+2*m);
    }
    }   
    }
    }
}

int ultimo(int p[],int N,int L){
    int low=0,hi=N-1,r=0;
    while(low<=hi){
        int m=low+(hi-low);
        if(p[m]<=L/2){
            r=m;
            low=m+1;
        }
        else{
            hi=m-1;
        }
    }
    return r;
}
int medio(int p[],int K,int L,int N,int r){
    long long ans=0;
    for(int i=r+1;i<N;i+=K){
        ans+=2*(L-p[i]);
    }
    for(int i=r;i>=0;i-=K){
        ans+=2*p[i];
    }
    return ans;
}
 
 
long long int dfs2(bool b,int K, int box2[],long long int L,int N,int tk){
    long long int j=0,m=1e12;
for(int i=N-1;i>=0;i--){
    if(box2[i]!=-1){
        int x=box2[i];
        if(K>=1){
            K--;
            if(x>L/2){
                b=false;
                j=x;
            }
            else if(m==1e12){
                m=x;
                if(2*m+2*(L-j)<=L){
                return 2*(L-j);
                }
            }
            n2--;
            box2[i]=-1;
        }
        if(K==0||n2==0){
            if(x>L/2)return 2*(L-x);
            else if(b){
                return 2*m;
            }
            else{
                return min(L,2*m+2*(L-j));
            }
        }
    }
}
}
 
long long delivery(int N, int K, int L, int p[]) {
    n=N;
    n2=N;
    long long int r1=1e18;
    if(L<N){
    int u=ultimo(p,N,L);
    long long int r1=medio(p,K,L,N,u);
    }
    for(int i=0;i<N;i++){
        if(p[i]==0){
            p[i]=-1;
            n--;
            n2--;
        }
        else{
            break;
        }
    }
    int p2[N];
    for(int i=0;i<N;i++)p2[i]=p[i];
    long long int r=0;
    long long int r2=0;
    while(n>0){
        bool b=true;
        r+=dfs(b,K,p,L,N,K);
    }
    while(n2>0){
        bool b=true;
        r2+=dfs2(b,K,p2,L,N,K);
    }
    return min(r,min(r1,r2));
}

Compilation message (stderr)

boxes.cpp: In function 'long long int dfs(bool, int, int*, long long int, int, int)':
boxes.cpp:16:13: warning: conversion from 'long long int' to 'double' may change value [-Wconversion]
   16 |     else if(j==1e12){
      |             ^
boxes.cpp:7:68: warning: unused parameter 'tk' [-Wunused-parameter]
    7 | long long int dfs(bool b,int K,int box[],long long int L,int N,int tk){
      |                                                                ~~~~^~
boxes.cpp: In function 'int medio(int*, int, int, int, int)':
boxes.cpp:60:12: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
   60 |     return ans;
      |            ^~~
boxes.cpp: In function 'long long int dfs2(bool, int, int*, long long int, int, int)':
boxes.cpp:75:21: warning: conversion from 'long long int' to 'double' may change value [-Wconversion]
   75 |             else if(m==1e12){
      |                     ^
boxes.cpp:64:71: warning: unused parameter 'tk' [-Wunused-parameter]
   64 | long long int dfs2(bool b,int K, int box2[],long long int L,int N,int tk){
      |                                                                   ~~~~^~
boxes.cpp: In function 'long long int delivery(int, int, int, int*)':
boxes.cpp:103:19: warning: declaration of 'r1' shadows a previous local [-Wshadow]
  103 |     long long int r1=medio(p,K,L,N,u);
      |                   ^~
boxes.cpp:100:19: note: shadowed declaration is here
  100 |     long long int r1=1e18;
      |                   ^~
boxes.cpp:103:19: warning: unused variable 'r1' [-Wunused-variable]
  103 |     long long int r1=medio(p,K,L,N,u);
      |                   ^~
boxes.cpp: In function 'long long int dfs(bool, int, int*, long long int, int, int)':
boxes.cpp:36:1: warning: control reaches end of non-void function [-Wreturn-type]
   36 | }
      | ^
boxes.cpp: In function 'long long int dfs2(bool, int, int*, long long int, int, int)':
boxes.cpp:95:1: warning: control reaches end of non-void function [-Wreturn-type]
   95 | }
      | ^

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