Submission #500512

#	Time	Username	Problem	Language	Result	Execution time	Memory
500512		LittleCube	Worm Worries (BOI18_worm)	C++14	10 / 100	1 ms	328 KiB

worm

#include <bits/stdc++.h>

int arr[1000005];
int N, M, K, Q;

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

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

const double phi = 0.618033988749894848204586;

int main()
{

    (void)scanf("%d %d %d %d", &N, &M, &K, &Q);
    if (M == 1 && K == 1)
    {
        int L = 1, R = N;

        while (R - L >= 3)
        {
            int lmid = round(phi * L + (1.0 - phi) * R), rmid = round((1.0 - phi) * L + phi * R);
            int lans = query(lmid, 1, 1), rans = query(rmid, 1, 1);
            if (lans >= rans)
                R = rmid - 1;
            else
                L = lmid + 1;
        }
        for (int i = L; i <= R; i++)
            if (query(i - 1, 1, 1) <= query(i, 1, 1) && query(i, 1, 1) >= query(i + 1, 1, 1))
                guess(i, 1, 1);
    }
}
// 1 4 2 5 8 | 4 2 5 4 2

Compilation message (stderr)

worm.cpp: In function 'int query(int, int, int)':
worm.cpp:13:20: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   13 |         (void)scanf("%d", &ans);
      |               ~~~~~^~~~~~~~~~~~
worm.cpp: In function 'int main()':
worm.cpp:32:16: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   32 |     (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