Submission #759517

#	Time	Username	Problem	Language	Result	Execution time	Memory
759517		rshohruh	Aliens (IOI07_aliens)	C++14	100 / 100	1 ms	208 KiB

aliens

#include <iostream>
using namespace std;
#define int long long
int n;
bool query(int x, int y){
    if(x < 1 || x > n || y < 1 || y > n) return false;
    cout << "examine " << x << ' ' << y << endl;
    string s;
    cin >> s;
    return (s == "true" ? true : false);
}
signed main(){
    int X, Y;
    cin >> n >> X >> Y;
    int l = 1, r = X, x, y;
    while(l != r){
        x = (l + r) / 2;
        if(query(x, Y)) r = x;
        else l = x + 1;
    }
    int lx = l, m;
    l = X;
    r = n;
    while(l != r){
        x = (l + r + 1) / 2;
        if(query(x, Y)) l = x;
        else r = x - 1;
    }
    int rx = l;
    if(!query((lx + rx) / 2, Y)) m = (rx - lx + 1) / 3;
    else if(!query(lx + (rx - lx + 1) / 5, Y)) m = (rx - lx + 1) / 5;
    else m = rx - lx + 1;
    l = Y - m;
    r = Y;
    x = lx + m / 2;
    while(l != r){
        y = (l + r) / 2;
        if(query(x, y)) r = y;
        else l = y + 1;
    }
    y = l + m / 2;
    while(query(x-m, y - m)) {
        x -= m;
        y -= m;
    }
    while(query(x - 2 * m, y)) x -= 2 * m;
    while(query(x, y - 2 * m)) y -= 2 * m;
    x += 2 * m;
    y += 2 * m;
    cout << "solution " << x << ' ' << y << 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: 10 / 10
• Subtask 10: 10 / 10