Submission #723574

#	Time	Username	Problem	Language	Result	Execution time	Memory
723574		dxz05	Worm Worries (BOI18_worm)	C++17	10 / 100	1 ms	208 KiB

worm

#include <stdio.h>
#include <stdlib.h>
#include <bits/stdc++.h>

using namespace std;

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

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

typedef long long ll;

int N, M, K;

map<ll, int> mp;
int ask(int x, int y, int z){
    if (x < 1 || x > N) return 0;
    if (y < 1 || y > M) return 0;
    if (z < 1 || z > K) return 0;

    ll val = x * 1'000'010'000'100LL + y * 1'000'002 + z;
    if (mp.find(val) != mp.end()) return mp[val];
    return mp[val] = query(x, y, z);
}

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

	int l = 1, r = N;
    int ans = -1;

    while (l <= r){
        int mid = (l + r) >> 1;
        if (ask(mid, 1, 1) >= ask(mid + 1, 1, 1)){
            ans = mid;
            r = mid - 1;
        } else {
            ans = mid + 1;
            l = mid + 1;
        }
    }

    guess(ans, 1, 1);
}

Compilation message (stderr)

worm.cpp: In function 'int query(int, int, int)':
worm.cpp:11:13: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   11 |  (void)scanf("%d", &ans);
      |        ~~~~~^~~~~~~~~~~~
worm.cpp: In function 'int main()':
worm.cpp:39:13: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   39 |  (void)scanf("%d %d %d %d", &N, &M, &K, &Q);
      |        ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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