Cod sursa(job #66375)

Utilizator floringh06Florin Ghesu floringh06 Data 17 iunie 2007 23:20:10
Problema Semne Scor 15
Compilator cpp Status done
Runda Arhiva de probleme Marime 1.13 kb
using namespace std;

#define MAX_N 50005

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <fstream>

FILE *fin=fopen("semne.in","r"),
     *fout=fopen("semne.out","w");
   
int n,i,sp,sm,s;
int a[MAX_N];
short p[MAX_N];   
          
int main()
{   
    fscanf(fin,"%d %d\n",&n,&s);
    memset(p,0,sizeof(p));
    for (i=1; i<=n; i++)
    {
     fscanf(fin,"%d",a+i);
     sp+=a[i]; p[i]=1;
    }
    int c,v1,v2;
    while (sp-sm!=s) 
     {
      c=rand() % n ;  
         
      if (sp-sm>s && p[c]==1)
       {
         v1=sp-sm; v2=sp-a[c]-sm-a[c];
         if (abs(s-v1)<abs(s-v2)) continue;         
         sp-=a[c]; sm+=a[c];
         p[c]=0;
         continue;
       }
      if (sp-sm<s && p[c]==0)
       { 
         v1=sp-sm; v2=sp+a[c]-sm+a[c];
         if (abs(s-v1)<abs(s-v2)) continue;                 
         sp+=a[c]; sm-=a[c];
         p[c]=1;
         continue;
       }
     }
    for (i=1; i<=n; i++) 
     if (p[i]==1) fprintf(fout,"+");
      else fprintf(fout,"-");                    
    
    fclose(fin); fclose(fout);  
      
    return 0;
}