Submission #759522

#	Time	Username	Problem	Language	Result	Execution time	Memory
759522		gun_gan	Aliens (IOI07_aliens)	C++17	10 / 100	2 ms	464 KiB

aliens

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
 
int dx[4] = {1, 0, -1, 0}, dy[4] = {0, 1, 0, -1};
 
ll N, X, Y;
ll xMin, xMax, yMin, yMax;
 
bool can(ll x, ll y) {
      if(x <= 0 || x > N || y <= 0 || y > N) return 0;
      cout << "examine " << x << " " << y << endl;
 
      string s;
      cin >> s;
 
      return s == "true"; 
}
 
void work(int k) {
      ll l = 0, r = 1e9, res = 0;
      while(l <= r) {
            ll m = (l + r) >> 1;
            if(can(X + 2 * m * dx[k], Y + 2 * m * dy[k])) {
                  l = m + 1, res = m;
            } else {
                  r = m - 1;
            }
      }
 
      xMin = min(xMin, X + 2 * res * dx[k]);
      xMax = max(xMax, X + 2 * res * dx[k]);
      yMin = min(yMin, Y + 2 * res * dy[k]);
      yMax = max(yMax, Y + 2 * res * dy[k]);     
}
 
int main() {
      // ios_base::sync_with_stdio(0); cin.tie(0);
 
      cin >> N >> X >> Y;
      xMin = xMax = X;
      yMin = yMax = Y;
 
      for(int k = 0; k < 4; k++) work(k);

      assert(xMax - xMin == yMax - yMin && (xMax - xMin + 1) & 1);
 
      // cout << xMin << " " << yMin << endl;
      // cout << xMax << " " << yMax << endl;
 
      int decx = 0, decy = 0, incx = 0, incy = 0;
 
      if(can(xMin - 1, yMin - 1)) {
            decx = 1;
            decy = 1;
      }

      if(can(xMin + 1, yMin - 1)) {
            if(xMin == xMax) incx = 1;
            decy = 1;
      }

      if(can(xMin - 1, yMin + 1)) {
            decx = 1;
            if(yMin == yMax) incy = 1;
      }
 
      if(can(xMin - 1, yMax + 1)) {
            decx = 1;
            incy = 1;
      }

      if(can(xMin + 1, yMax + 1)) {
            if(xMin == xMax) incx = 1;
            incy = 1;
      }

      if(can(xMin - 1, yMax - 1)) {
            decx = 1;
            if(yMin == yMax) decy = 1;
      }
 
      if(can(xMax + 1, yMin - 1)) {
            incx = 1;
            decy = 1;
      }

      if(can(xMax - 1, yMin - 1)) {
            if(xMin == xMax) decx = 1;
            decy = 1;
      }

      if(can(xMax + 1, yMin + 1)) {
            incx = 1;
            if(yMin == yMax) incy = 1;
      }
 
      if(can(xMax + 1, yMax + 1)) {
            incx = 1;
            incy = 1;
      }   

      if(can(xMax - 1, yMax + 1)) {
            if(xMin == xMax) decx = 1;
            incy = 1;
      }      

      if(can(xMax + 1, yMax - 1)) {
            incx = 1;
            if(yMin == yMax) decy = 1;
      }         
 
      xMin -= decx;
      yMin -= decy;
      xMax += incx;
      yMax += incy;     
 
      
      cout << "solution " << (xMin + xMax) / 2 << " " << (yMin + yMax) / 2 << endl;
 
}

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