Submission #114427

#	Time	Username	Problem	Language	Result	Execution time	Memory
114427		popovicirobert	Aliens (IOI07_aliens)	C++14	100 / 100	3 ms	512 KiB

aliens

#include <bits/stdc++.h>
#define lsb(x) (x & (-x))
#define ll long long
#define ull unsigned long long
// 217
// 44

using namespace std;

ll N, X0, Y0, M;

/*inline string in(int x, int y) {
    return ((x - X0) / M + (y - Y0) / M) % 2 == 0 ? "true" : "false";
}*/

inline bool ask(ll x, ll y) {

    //if(x < X0 || x >= X0 + 5 * M || y < Y0 || y >= Y0 + 5 * M) return 0;
    if(x > N || x <= 0 || y > N || y <= 0) return 0;

    cout << "examine ";
    cout << x << " " << y << "\n";
    string str;

    cin >> str;
    //str = in(x, y);

    return str == "true" ? 1 : 0;
}

inline void solve(ll n, ll x0, ll y0) {

    ll x1 = x0, y1 = y0;
    int step = 0;

    while(ask(x1 - (1LL << step), y1)) {
        step++;
    }

    while(step > 0) {
        step--;
        if(ask(x1 - (1LL << step), y1)) {
            x1 -= (1LL << step);
        }
    }

    while(ask(x1, y1 - (1LL << step))) {
        step++;
    }

    while(step > 0) {
        step--;
        if(ask(x1, y1 - (1LL << step))) {
            y1 -= (1LL << step);
        }
    }

    ll x2 = x0, y2 = y0;

    while(ask(x2 + (1LL << step), y2)) {
        step++;
    }

    while(step > 0) {
        step--;
        if(ask(x2 + (1LL << step), y2)) {
            x2 += (1LL << step);
        }
    }

    ll m = x2 - x1 + 1;

    while(1) {
        if(ask(x1 - 2 * m, y1)) {
            x1 -= 2 * m;
            continue;
        }
        else if(ask(x1, y1 - 2 * m)) {
            y1 -= 2 * m;
            continue;
        }
        else if(ask(x1 - m, y1 - m)) {
            x1 -= m, y1 -= m;
            continue;
        }
        break;
    }

    cout << "solution " << x1 - 1 + 2 * m + (m + 1) / 2 << " " << y1 - 1 + 2 * m + (m + 1) / 2 << "\n";

}

int main() {
    //ifstream cin("A.in");
    //ofstream cout("A.out");
    ll x0, y0;
    //ios::sync_with_stdio(false);
    //cin.tie(0), cout.tie(0);

    //cin >> N >> X0 >> Y0 >> M;
    cin >> N >> x0 >> y0;

    //ll x0 = 16, y0 = 6;

    solve(N, x0, y0);

    //cin.close();
    //cout.close();
    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