Cod sursa(job #2340110)

Utilizator Hexor_ALXAlexandru Olteanu Hexor_ALX Data 9 februarie 2019 19:48:16
Problema Cautare binara Scor 60
Compilator cpp-32 Status done
Runda Arhiva educationala Marime 1.43 kb
#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
ll const mod=1000000007;
ll const md=998244353;
ll mypowr(ll a,ll b) {ll res=1;a%=mod; assert(b>=0);
for(;b;b>>=1){if(b&1)res=res*a%mod;a=a*a%mod;}return res;}
ll mypow(ll a,ll b) {ll res=1;assert(b>=0);
for(;b;b>>=1){if(b&1)res=res*a;a=a*a;}return res;}
ifstream in("cautbin.in");
ofstream out("cautbin.out");
#define mp make_pair
#define pb push_back
#define pf push_front
#define fi first
#define se second

ll cnt;
int f[100005];
void dfs(ll st,ll dr,ll nr){
if(st>dr)return;
ll m=(st+dr)/2;
if(f[m]==nr)cnt=max(cnt,m);
if(f[m]<=nr){
    dfs(m+1,dr,nr);
}
else{
    dfs(st,m-1,nr);
}
}
void dfs1(ll st,ll dr,ll nr){
if(st>dr)return;
ll m=(st+dr)/2;
if(f[m]<=nr)cnt=max(cnt,m);
if(f[m]<=nr){
    dfs1(m+1,dr,nr);
}
else{
    dfs1(st,m-1,nr);
}
}
void dfs2(ll st,ll dr,ll nr){
if(st>dr)return;
ll m=(st+dr)/2;
if(f[m]>=nr)cnt=min(cnt,m);
if(f[m]<nr){
    dfs2(m+1,dr,nr);
}
else{
    dfs2(st,m-1,nr);
}
}



int main()
{   cout<<fixed<<setprecision(12);
    cin.tie(0);cout.tie(0);
    ios_base::sync_with_stdio(0);

    ll n;
    in>>n;
    for(int i=1;i<=n;++i){
        in>>f[i];
    }
    ll k;in>>k;
    while(k--){
        ll a,b;in>>a>>b;
        cnt=-1;
        if(a==0)dfs(1,n,b);
        if(a==1)dfs1(1,n,b);
        if(a==2)cnt=9e15,dfs2(1,n,b);
        out<<cnt<<'\n';
    }






    return 0;
}