Submission #500510

#	Time	Username	Problem	Language	Result	Execution time	Memory
500510		LittleCube	Worm Worries (BOI18_worm)	C++14	10 / 100	1 ms	340 KiB

worm

#include <bits/stdc++.h>

int arr[1000005];

int query(int x, int y, int z)
{
    if (arr[x] == 0)
    {
        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);
}

int main()
{
    int N, M, K, Q;
    (void)scanf("%d %d %d %d", &N, &M, &K, &Q);
    if (M == 1 && K == 1)
    {
        int L = 1, R = N;
        int lmid = round(0.618 * L + 0.382 * R), rmid = round(0.382 * L + 0.618 * R);
        while (L < R)
        {
            if(R - L + 1 == 3)
                lmid = L + 1, rmid = L + 2;
            int lans = query(lmid, 1, 1), rans = query(rmid, 1, 1);
            if (lans >= rans)
            {
                R = rmid - 1;
                rmid = lmid;
                lmid = round(0.618 * L + 0.382 * R);
            }
            else
            {
                L = lmid + 1;
                lmid = rmid;
                rmid = round(0.382 * L + 0.618 * R);
            }
        }
        guess(L, 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:12:20: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   12 |         (void)scanf("%d", &ans);
      |               ~~~~~^~~~~~~~~~~~
worm.cpp: In function 'int main()':
worm.cpp:29:16: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   29 |     (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