Submission #598469

#	Time	Username	Problem	Language	Result	Execution time	Memory
598469		PoonYaPat	Aliens (IOI07_aliens)	C++14	0 / 100	1 ms	208 KiB

aliens

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

ll n,x,y;
ll bn,bs,be,bw;

bool examine(ll x, ll y) {
    if (x<1 || y<1 || x>n || y>n) return false;
    cout<<"examine "<<x<<" "<<y<<flush;
    string s;
    cin>>s;
    if (s=="true") return true;
    else return false;
}

int main() {
    cin>>n>>x>>y;

    //east
    ll k=1;
    while (examine(x+k,y)) k*=2;
    ll l=x, r=min(n,x+k);
    /*
    while (r>=l) {
        ll mid=(l+r)/2;
        if (examine(mid,y)) l=mid+1;
        else r=mid-1;
    }
    be=r; */
/*
    //north
    k=1;
    while (examine(x,y+k)) k*=2;
    l=y; r=min(n,y+k);
    while (r>=l) {
        ll mid=(l+r)/2;
        if (examine(x,mid)) l=mid+1;
        else r=mid-1;
    }
    bn=r;

    //west
    k=1;
    while (examine(x-k,y)) k*=2;
    l=max(1ll,x-k); r=x;
    while (r>=l) {
        int mid=(l+r)/2;
        if (examine(mid,y)) r=mid-1;
        else l=mid+1;
    }
    bw=l;

    //south
    k=1;
    while (examine(x,y-k)) k*=2;
    l=y; r=max(1ll,y-k);
    while (r>=l) {
        int mid=(l+r)/2;
        if (examine(x,mid)) r=mid-1;
        else l=mid+1;
    }
    bs=l;
*/
    ll cx=(be+bw)/2, cy=(bn+bs)/2, sz=(be-bw+1)*2;
    ll ansx, ansy;
/*
    if (examine(cx+sz,cy)) { //have right

        if (examine(cx+2*sz,cy)) { //have 2 right
            ansx=cx+sz;

            if (examine(ansx,cy+2*sz)) ansy=cy+sz;
            else if (examine(ansx,cy-2*sz)) ansy=cy-sz;
            else ansy=cy;


        } else if (examine(cx-sz,cy)) { // have left and right
            ansx=cx;

            if (examine(ansx,cy+2*sz)) ansy=cy+sz;
            else if (examine(ansx,cy-2*sz)) ansy=cy-sz;
            else ansy=cy;

        } else {

            ansx=cx+sz/2;
            if (examine(ansx,cy+3*(sz/2))) ansy=cy+sz/2;
            else ansy=cy-sz/2;
        }
    } else { //have left
        if (examine(cx-2*sz,cy)) { //have 2 left
            ansx=cx-sz;

            if (examine(ansx,cy+2*sz)) ansy=cy+sz;
            else if (examine(ansx,cy-2*sz)) ansy=cy-sz;
            else ansy=cy;

        } else {
            ansx=cx-sz/2;
            if (examine(ansx,cy+3*(sz/2))) ansy=cy+sz/2;
            else ansy=cy-sz/2;
        }
    }
 */
    cout<<"solution "<<ansx<<" "<<ansy<<flush;
}

Compilation message (stderr)

aliens.cpp: In function 'int main()':
aliens.cpp:23:8: warning: unused variable 'l' [-Wunused-variable]
   23 |     ll l=x, r=min(n,x+k);
      |        ^
aliens.cpp:23:13: warning: unused variable 'r' [-Wunused-variable]
   23 |     ll l=x, r=min(n,x+k);
      |             ^
aliens.cpp:65:8: warning: unused variable 'cx' [-Wunused-variable]
   65 |     ll cx=(be+bw)/2, cy=(bn+bs)/2, sz=(be-bw+1)*2;
      |        ^~
aliens.cpp:65:22: warning: unused variable 'cy' [-Wunused-variable]
   65 |     ll cx=(be+bw)/2, cy=(bn+bs)/2, sz=(be-bw+1)*2;
      |                      ^~
aliens.cpp:65:36: warning: unused variable 'sz' [-Wunused-variable]
   65 |     ll cx=(be+bw)/2, cy=(bn+bs)/2, sz=(be-bw+1)*2;
      |                                    ^~
aliens.cpp:106:24: warning: 'ansx' is used uninitialized in this function [-Wuninitialized]
  106 |     cout<<"solution "<<ansx<<" "<<ansy<<flush;
      |                        ^~~~
aliens.cpp:106:35: warning: 'ansy' is used uninitialized in this function [-Wuninitialized]
  106 |     cout<<"solution "<<ansx<<" "<<ansy<<flush;
      |                                   ^~~~

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