Submission #1107278

#	Time	Username	Problem	Language	Result	Execution time	Memory
1107278		vjudge1	Aliens (IOI07_aliens)	C++17	100 / 100	4 ms	512 KiB

aliens

#include<bits/stdc++.h>
#define int long long

using namespace std;

int n, xo, yo; 
string ck;

bool check(int x, int y){
    if(x < 1 || x > n || y < 1 || y > n) return false;
    cout << "examine " << x << ' ' << y << endl;
    cin >> ck;
    if(ck == "false") return false;
    return true;
}

int32_t main(){
    cin >> n >> xo >> yo;
    int lx = xo, ly = yo, x, y;
    for(int j = 0; j < 3; ++j){
        for(int i = 31; i >= 0; --i){
            x = lx - (1ll<<i), y = ly;
            if(check(x, y)) lx = x, ly = y;
        }
    }
    for(int j = 0; j < 3; ++j){
        for(int i = 31; i >= 0; --i){
            x = lx, y = ly - (1ll<<i);
            if(check(x, y)) lx = x, ly = y;
        }
    }
    for(int i = 31; i >= 0; --i){
        x = lx - (1<<i), y = ly - (1ll<<i);
        if(check(x, y)) lx = x, ly = y;
    }
    int m = 0ll;
    x = lx, y = ly;
    for (int i = 31; i >= 0; i--) {
        if (check(x + (1ll<<i), y + (1ll<<i))) m += (1ll<<i), x += (1ll<<i), y += (1ll<<i);
    }
    cout << "solution " << lx + m/2 << " " << ly + m/2 << endl;
}

• 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