Mai intai trebuie sa te autentifici.
Cod sursa(job #651685)
Utilizator | Data | 21 decembrie 2011 01:58:10 | |
---|---|---|---|
Problema | Cautare binara | Scor | 40 |
Compilator | cpp | Status | done |
Runda | Arhiva educationala | Marime | 1.34 kb |
#include<fstream>
#define maxn 100001
using namespace std;
int n, v[maxn], m, x, j, choice;
ifstream f("cautbin.in");
ofstream g("cautbin.out");
int c0(int v[], int value, int low, int high)
{int mid;
while(low<=high)
{mid=low+(high-low)/2;
if(v[mid]==value)
if(v[mid+1]!=value)
return mid;
if(v[mid]>value)
high=mid-1;
else low=mid+1;
}
return -1;
}
int c1(int v[], int value, int low, int high)
{int mid;
while(low<high)
{mid=low+(high-low)/2;
if(v[mid]<=value)
low=mid+1;
else high=mid-1;
}
mid=low+(high-low)/2;
if(v[mid]>value)
mid--;
return mid;
}
int c2(int v[], int value, int low, int high)
{int mid;
while(low<high)
{mid=low+(high-low)/2;
if(v[mid]>=value)
high=mid-1;
else low=mid+1;
}
mid=low+(high-low)/2;
if(v[mid]<value)
mid++;
return mid;
}
int main()
{f>>n;
for(j=1; j<=n; j++)
f>>v[j];
f>>m;
for(j=1; j<=m; j++)
{f>>choice;
f>>x;
switch(choice)
{case 0: g<<c0(v, x, 1, n)<<endl;
break;
case 1: g<<c1(v, x, 1, n)<<endl;
break;
case 2: g<<c2(v, x, 1, n)<<endl;
break;
}
}
f.close();
g.close();
return 0;
}