Submission #572751

#	Time	Username	Problem	Language	Result	Execution time	Memory
572751		snasibov05	Aliens (IOI07_aliens)	C++14	80 / 100	4 ms	336 KiB

aliens

#include <bits/stdc++.h>

using namespace std;

bool ask(int x, int y){
    cout << "examine " << x << " " << y << endl;
    string str; cin >> str;
    if (str == "true") return true;
    else return false;
}

int main() {
    int n, x0, y0; cin >> n >> x0 >> y0;

    int xt = x0, yt = y0, xb = x0;

    int x = 1;
    while (xt - x >= 1 && ask(xt - x, y0)) xt -= x, x *= 2;
    int l = xt - x, r = xt;
    while (l <= r){
        int mid = (l + r) / 2;
        if (mid >= 1 && ask(mid, y0)) xt = mid, r = mid - 1;
        else l = mid + 1;
    }

    x = 1;
    while (xb + x <= n && ask(xb + x, y0)) xb += x, x *= 2;
    l = xb, r = xb + x;
    while (l <= r){
        int mid = (l + r) / 2;
        if (mid <= n && ask(mid, y0)) xb = mid, l = mid + 1;
        else r = mid - 1;
    }

    x = 1;
    while (yt - x >= 1 && ask(x0, yt - x)) yt -= x, x *= 2;
    l = yt - x, r = yt;
    while (l <= r){
        int mid = (l + r) / 2;
        if (mid >= 1 && ask(x0, mid)) yt = mid, r = mid - 1;
        else l = mid + 1;
    }

    int sz = xb - xt + 1;

    while (xt - 2*sz >= 1 && ask(xt - 2*sz, yt)) xt = xt - 2*sz;
    while (true){
        if (xt - sz >= 1 && yt - sz >= 1 && ask(xt - sz, yt - sz)) xt = xt - sz, yt = yt - sz;
        else if (xt + sz <= n && yt - sz >= 1 && ask(xt + sz, yt - sz)) xt = xt + sz, yt = yt - sz;
        else break;
    }

    int xres = xt + 2*sz + sz / 2;
    int yres = yt + 2*sz + sz / 2;
    cout << "solution " << xres << " " << yres << endl;

    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: 0 / 10
• Subtask 10: 0 / 10