Submission #180681

#	Time	Username	Problem	Language	Result	Execution time	Memory
180681		gs13068	Worm Worries (BOI18_worm)	C++17	32 / 100	3 ms	380 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 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);
  }
}

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:32:2: 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;
             ^

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