Submission #180729

#	Time	Username	Problem	Language	Result	Execution time	Memory
180729		gs13068	Worm Worries (BOI18_worm)	C++17	32 / 100	3066 ms	2752 KiB

worm

#include <stdio.h>
#include <stdlib.h>
#include <map>

int __query(int x, int y, int z) {
	printf("? %d %d %d\n", x, y, z);
	fflush(stdout);
	int ans = -1;
	static int t;
  (void)scanf("%d", &ans);
	if (ans == -1) exit(0);
	return ans;
}

std::map<int, int> M;
int query(int x, int y, int z) {
  int t = x | y << 10 | z << 20;
  if (M.find(t) == M.end()) M[t] = __query(x, y, z);
  return M[t];
}

__attribute__((noreturn))
void guess(int x, int y, int z) {
	printf("! %d %d %d\n", x, y, z);
	exit(0);
}

const double p = 0.381966;

int px[6] = { 1, -1, 0, 0, 0, 0 };
int py[6] = { 0, 0, 1, -1, 0, 0 };
int pz[6] = { 0, 0, 0, 0, 1, -1 };

int main() {
	int N, M, K, Q;
	(void)scanf("%d %d %d %d", &N, &M, &K, &Q);

	// TODO do something smart
	if (M == 1) {
    int L = 1, R = N;
    int T = L * p + R * (1 - p) + .5;
    while (L < R) {
      if (T + T == L + R) T = L * (1 - p) + R * p + .236;
      int T2 = L + R - T;
      if (T > T2) {
        int T3 = T;
        T = T2;
        T2 = T3;
      }
      if (query(T, 1, 1) > query(T2, 1, 1)) R = T2 - 1;
      else {
        L = T + 1;
        T = T2;
      }
    }
    guess(L, 1, 1);
  }
  int i, x, y, z, w = -1;
  for (i = 0; i < Q / 3; i++) {
    int tx = rand() % N + 1;
    int ty = rand() % M + 1;
    int tz = rand() % K + 1;
    if (query(tx, ty, tz) > w) {
      w = query(tx, ty, tz);
      x = tx;
      y = ty;
      z = tz;
    }
  }
  do {
    for (i = 0; i < 6; i++) {
      int tx = x + px[i], ty = y + py[i], tz = z + pz[i];
      if (tx > 0 && tx <= N && ty > 0 && ty <= M && tz > 0 && tz <= K && query(tx, ty, tz) > query(x, y, z)) {
        x = tx;
        y = ty;
        z = tz;
        break;
      }
    }
  } while (i == 6);
  guess(x, y, z);
}

Compilation message (stderr)

worm.cpp: In function 'int __query(int, int, int)':
worm.cpp:9:13: warning: unused variable 't' [-Wunused-variable]
  static int t;
             ^
worm.cpp:10:3: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   (void)scanf("%d", &ans);
   ^~~~~~~~~~~~~~~~~~~~~~~
worm.cpp: In function 'int main()':
worm.cpp:36:2: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  (void)scanf("%d %d %d %d", &N, &M, &K, &Q);
  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
worm.cpp: At global scope:
worm.cpp:9:13: warning: 't' defined but not used [-Wunused-variable]
  static int t;
             ^
worm.cpp: In function 'int main()':
worm.cpp:72:43: warning: 'z' may be used uninitialized in this function [-Wmaybe-uninitialized]
       int tx = x + px[i], ty = y + py[i], tz = z + pz[i];
                                           ^~
worm.cpp:72:27: warning: 'y' may be used uninitialized in this function [-Wmaybe-uninitialized]
       int tx = x + px[i], ty = y + py[i], tz = z + pz[i];
                           ^~
worm.cpp:72:11: warning: 'x' may be used uninitialized in this function [-Wmaybe-uninitialized]
       int tx = x + px[i], ty = y + py[i], tz = z + pz[i];
           ^~

• Subtask 1: 10 / 10
• Subtask 2: 22 / 22
• Subtask 3: 0 / 12
• Subtask 4: 0 / 19
• Subtask 5: 0 / 14
• Subtask 6: 0 / 23