Submission #969798

#	Time	Username	Problem	Language	Result	Execution time	Memory
969798		NoMercy	Aliens (IOI07_aliens)	C++14	50 / 100	1 ms	440 KiB

aliens

#include <bits/stdc++.h>
using namespace std;
 
    
int TIME = clock();
 
#define file \
            freopen("in.txt" , "r" , stdin); \
            freopen("out.txt" , "w" , stdout);
 
typedef long long ll;
 
void test_case () {
    ll n , x , y;
    cin >> n >> x >> y;
    auto ask = [&](ll fi , ll se) -> int {
        cout << "examine " << fi << " " << se << endl;
        string as;
        cin >> as;
        return (as == "true");
    };
    ll l = 1, r = x , best[4] = {x , y , x , y};
    while (l <= r) {
        ll mid = (l + r) / 2LL;
        if (ask(mid , y) == true && ask((mid + x) / 2LL , y) == true) {
            best[0] = mid;
            r = mid - 1;
        } else {
            l = mid + 1;
        }
    }
    l = 1 , r = y;
    while (l <= r) {
        ll mid = (l + r) / 2LL;
        if (ask(x , mid) == true && ask(x , (mid + y) / 2LL) == true) {
            best[1] = mid;
            r = mid - 1;
        } else {
            l = mid + 1;
        }
    }
    l = x , r = n;
    while (l <= r) {
        ll mid = (l + r) / 2LL;
        if (ask(mid , y) == true && ask((mid + x) / 2LL , y) == true) {
            best[2] = mid;
            l = mid + 1;
        } else {
            r = mid - 1;
        }
    }
    l = y , r = n;
    while (l <= r) {
        ll mid = (l + r) / 2LL;
        if (ask(x , mid) == true && ask(x , (mid + y) / 2LL) == true) {
            best[3] = mid;
            l = mid + 1;
        } else {
            r = mid - 1;
        }
    }
    // cout << best[0] << " " << best[1] << " " << best[2] << " " << best[3] << endl;
    // assert(best[2] - best[0] == best[3] - best[1]);
    x = (best[0] + best[2]) / 2LL;
    y = (best[1] + best[3]) / 2LL;
    ll m = max(best[2] - best[0] + 1 , best[3] - best[1] + 1);
    while (x - m > 0 && y - m > 0) {
        if (ask(x - m , y - m) == true) {
            x -= m;
            y -= m;
        } else {
            break;
        }
    }
    while (x - m - m > 0) {
        if (ask(x - m - m , y) == true) {
            x -= m * 2LL;
        } else {
            break;
        }
    }
    while (y - m - m > 0) {
        if (ask(x , y - m - m) == true) {
            y -= m * 2LL;
        } else {
            break;
        }
    }
    cout << "solution " << x + m + m << " " << y + m + m << endl;
}
 
int32_t main () {
 
        // file
    
 
    int t = 1;
    // cin >> t;
 
    while (t --) {
        test_case();
    }
 
    cerr << "\nTime elapsed: " << (clock() - TIME) * 1000.0 / CLOCKS_PER_SEC << " ms\n";
    return 0;
}

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 10 / 10
• Subtask 5: 0 / 10
• Subtask 6: 0 / 10
• Subtask 7: 0 / 10
• Subtask 8: 10 / 10
• Subtask 9: 0 / 10
• Subtask 10: 0 / 10