Submission #642355

#	Time	Username	Problem	Language	Result	Execution time	Memory
642355		devariaota	Aliens (IOI07_aliens)	C++17	100 / 100	2 ms	272 KiB

aliens

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<ll, ll> pll;
typedef pair<int, int> pii;
typedef vector<int> vi;
typedef vector<ll> vll;
const ll mod=1e9+7;
const ll maxn=2e6+5;
const ll INF=1e18;
#define ok ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#define fi first
#define se second
#define pb push_back
#define ub upper_bound
#define lb lower_bound
#define endl '\n'
ll n, x, y, l, r, u, d;
string jwb;
int mx=-1;
int main() {
    ok
    cin >> n >> x >> y;
    for(int i=0; i<=30; i++) {
        ll nx=x+(1<<i);
        if(nx>n || nx<1) break;
        cout << "examine " << nx << " " << y << endl;
        cout.flush();
        cin >> jwb;
        if(jwb=="true") {
            mx=i;
        } else break;
    }
    if(mx>=0) {
        r=x+(1<<mx);
    } else r=x;
    for(int i=mx-1; i>=0; i--) {
        ll nx=r+(1<<i);
        if(nx>n || nx<1) continue;
        cout << "examine " << nx << " " << y << endl;
        cout.flush();
        cin >> jwb;
        if(jwb=="true") {
            r+=(1<<i);
        }
    }
    mx=-1;
    for(int i=0; i<=30; i++) {
        ll nx=x-(1<<i);
        if(nx>n || nx<1) break;
        cout << "examine " << nx << " " << y << endl;
        cout.flush();
        cin >> jwb;
        if(jwb=="true") {
            mx=i;
        } else break;
    }
    if(mx>=0) {
        l=x-(1<<mx);
    } else l=x;
    for(int i=mx-1; i>=0; i--) {
        ll nx=l-(1<<i);
        if(nx>n || nx<1) continue;
        cout << "examine " << nx << " " << y << endl;
        cout.flush();
        cin >> jwb;
        if(jwb=="true") {
            l-=(1<<i);
        }
    }
    mx=-1;
    for(int i=0; i<=30; i++) {
        ll nx=y+(1<<i);
        if(nx>n || nx<1) break;
        cout << "examine " << x << " " << nx << endl;
        cout.flush();
        cin >> jwb;
        if(jwb=="true") {
            mx=i;
        } else break;
    }
    if(mx>=0) {
        u=y+(1<<mx);
    } else u=y;
    for(int i=mx-1; i>=0; i--) {
        ll nx=u+(1<<i);
        if(nx>n || nx<1) continue;
        cout << "examine " << x << " " << nx << endl;
        cout.flush();
        cin >> jwb;
        if(jwb=="true") {
            u+=(1<<i);
        }
    }
    mx=-1;
    for(int i=0; i<=30; i++) {
        ll nx=y-(1<<i);
        if(nx>n || nx<1) break;
        cout << "examine " << x << " " << nx << endl;
        cout.flush();
        cin >> jwb;
        if(jwb=="true") {
            mx=i;
        } else break;
    }
    if(mx>=0) {
        d=y-(1<<mx);
    } else d=y;
    for(int i=mx-1; i>=0; i--) {
        ll nx=d-(1<<i);
        if(nx>n || nx<1) continue;
        cout << "examine " << x << " " << nx << endl;
        cout.flush();
        cin >> jwb;
        if(jwb=="true") {
            d-=(1<<i);
        }
    }
    ll midx=(l+r)/2, midy=(u+d)/2, sz=u-d+1;
    l=midx; r=midx; u=midy; d=midy;
    for(ll i=1; i<=2; i++) {
        ll nx=midx-2LL*i*sz;
        if(nx<1) break;
        cout << "examine " << nx << " " << midy << endl;
        cout.flush();
        cin >> jwb;
        if(jwb=="true") {
            l=nx;
        } else break;
    }
    for(ll i=1; i<=2; i++) {
        ll nx=midx+2LL*i*sz;
        if(nx>n) break;
        cout << "examine " << nx << " " << midy << endl;
        cout.flush();
        cin >> jwb;
        if(jwb=="true") {
            r=nx;
        } else break;
    }
    for(ll i=1; i<=2; i++) {
        ll nx=midy-2LL*i*sz;
        if(nx<1) break;
        cout << "examine " << midx << " " << nx << endl;
        cout.flush();
        cin >> jwb;
        if(jwb=="true") {
            d=nx;
        } else break;
    }
    for(ll i=1; i<=2; i++) {
        ll nx=midy+2LL*i*sz;
        if(nx>n) break;
        cout << "examine " << midx << " " << nx << endl;
        cout.flush();
        cin >> jwb;
        if(jwb=="true") {
            u=nx;
        } else break;
    }
    cout << "solution " << (l+r)/2 << " " << (u+d)/2 << endl;
    cout.flush();
    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