Submission #78627

#	Time	Username	Problem	Language	Result	Execution time	Memory
78627		Vardanyan	Aliens (IOI07_aliens)	C++14	100 / 100	4 ms	572 KiB

aliens

#include <bits/stdc++.h>
using namespace std;

bool ask(long long x,long long y){
    cout<<"examine "<<x<<" "<<y<<endl;
    fflush(stdout);
    string s;
    cin>>s;
    if(s == "true") return true;
    return false;
}
int main(){
    long long n,x0,y0;
    cin>>n>>x0>>y0;
    long long jmp = 1;
    long long l,r,up,down;
    while(1){
        if(x0+jmp<=n){
            if(ask(x0+jmp,y0)){
                jmp*=2;
                continue;
            }
            break;
        }
        else break;
    }
    long long x0_right = x0+jmp;
    long long lo = x0;
    long long hi = x0_right;
    r = x0;
    while(lo<=hi){
        long long mid = (lo+hi)/2;
        if(ask(mid,y0)){
            r = mid;
            lo = mid+1;
        }
        else hi = mid-1;
    }
    jmp = 1;
    while(1){
        if(x0-jmp>=1){
            if(ask(x0-jmp,y0)){
                jmp*=2;
                continue;
            }
            break;
        }
        else break;
    }
    long long x0_left = x0-jmp;
    lo = x0_left;
    hi = x0;
    l = x0;
    while(lo<=hi){
        long long mid = (lo+hi)/2;
        if(ask(mid,y0)){
            l = mid;
            hi = mid-1;
        }
        else lo = mid+1;
    }
    jmp = 1;
    while(1){
        if(y0+jmp<=n){
            if(ask(x0,y0+jmp)){
                jmp*=2;
                continue;
            }
            break;
        }
        else break;
    }
    long long y0_up = y0+jmp;
    lo = y0;
    hi = y0_up;
    up = y0;
    while(lo<=hi){
        long long mid = (lo+hi)/2;
        if(ask(x0,mid)){
            up = mid;
            lo = mid+1;
        }
        else hi = mid-1;
    }
    jmp = 1;
    while(1){
        if(y0-jmp>=1){
            if(ask(x0,y0-jmp)){
                jmp*=2;
                continue;
            }
            break;
        }
        else break;
    }
    long long y0_down = y0-jmp;
    lo = y0_down;
    hi = y0;
    down = y0;
    while(lo<=hi){
        long long mid = (lo+hi)/2;
        if(ask(x0,mid)){
            hi = mid-1;
            down = mid;
        }
        else{
            lo = mid+1;
        }
    }
    long long mx = (l+r)/2;
    long long my = (up+down)/2;
    long long M = r-l+1;
    long long aj = 0;
    if(mx+2*M<=n){ if(ask(mx+2*M,my)) aj++;}
    if(mx+4*M<=n){ if(ask(mx+4*M,my)) aj++;}
    long long dzax = 0;
    if(mx-2*M>=1){ if(ask(mx-2*M,my)) dzax++;}
    if(mx-4*M>=1){ if(ask(mx-4*M,my)) dzax++;}
    long long rig = mx+2*aj*M;
    long long lif = mx-2*dzax*M;
    long long ansx = (lif+rig)/2;
    long long verev = 0;
    if(my+2*M<=n){ if(ask(mx,my+2*M)) verev++;}
    if(my+4*M<=n){ if(ask(mx,my+4*M)) verev++;}
    long long nerq = 0;
    if(my-2*M>=1){ if(ask(mx,my-2*M)) nerq++;}
    if(my-4*M>=1){ if(ask(mx,my-4*M)) nerq++;}
    long long u = my+2*verev*M;
    long long dow = my-2*nerq*M;
    long long ansy = (u+dow)/2;
    cout<<"solution "<<ansx<<" "<<ansy<<endl;
    fflush(stdout);
    return 0;
}

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 10 / 10
• Subtask 5: 10 / 10
• Subtask 6: 10 / 10
• Subtask 7: 10 / 10
• Subtask 8: 10 / 10
• Subtask 9: 10 / 10
• Subtask 10: 10 / 10