Submission #1259905

#	Time	Username	Problem	Language	Result	Execution time	Memory
1259905		patgra	Worm Worries (BOI18_worm)	C++20	59 / 100	471 ms	500452 KiB

worm

#include <bits/stdc++.h>

#define rep(a,b,c) for(auto a = (b); a != (c); a++)
#define repD(a,b,c) for(auto a = (b); a != (c); a--)
#define repIn(a, b) for(auto& a : (b))
#define repIn2(a, b, c) for(auto& [a, b] : (c))

constexpr bool dbg = 0;
#define DEBUG if constexpr(dbg)
#define DC DEBUG std::cerr
#define eol std::endl

#define ll long long
#define pb push_back
#define ld long double

using namespace std;

constexpr bool readit = 0; 

vector<vector<vector<int>>> heights;
int N, M, K, Q, ogq;

int query(int x, int y, int z) {
    if(x < 0 || x >= N || y < 0 || y >= M || z < 0 || z >= K) return -1;
    if(heights[x][y][z] != -1) return heights[x][y][z];
    if(!Q) return -1;
	printf("? %d %d %d\n", x + 1, y + 1, z + 1);
	fflush(stdout);
    Q--;
	int ans = -1;
	(void)scanf("%d", &ans);
	if (ans == -1) exit(0);
    heights[x][y][z] = ans;
	return ans;
}

bool tryit(int x, int y, int z) {
    return (x == 0 || query(x, y, z) >= query(x - 1, y, z)) &&
            (x == N - 1 || query(x, y, z) >= query(x + 1, y, z)) && 
            (y == 0 || query(x, y, z) >= query(x, y - 1, z)) &&
            (y == M - 1 || query(x, y, z) >= query(x, y + 1, z)) &&
            (z == 0 || query(x, y, z) >= query(x, y, z - 1)) &&
            (z == K - 1 || query(x, y, z) >= query(x, y, z + 1));
}

void guess(int x, int y, int z) {
    x++, y++, z++;
	printf("! %d %d %d\n", x, y, z);
    x--, y--, z--;
    if constexpr(readit) assert((x == 0 || heights[x][y][z] >= heights[x - 1][y][z]) &&
            (x == N - 1 || heights[x][y][z] >= heights[x + 1][y][z]) && 
            (y == 0 || heights[x][y][z] >= heights[x][y - 1][z]) &&
            (y == M - 1 || heights[x][y][z] >= heights[x][y + 1][z]) &&
            (z == 0 || heights[x][y][z] >= heights[x][y][z - 1]) &&
            (z == K - 1 || heights[x][y][z] >= heights[x][y][z + 1]));
	exit(0);
}

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

    heights.resize(N, vector<vector<int>>(M, vector<int>(K, -1)));
    if constexpr(readit) rep(i, 0, N) rep(j, 0, M) rep(k, 0, K) scanf("%d", &heights[i][j][k]);
    mt19937 rnd(2137 * N + Q);
    array<int, 4> mx = {{-1, 0, 0, 0}};
    while(Q * 2 > ogq) {
        int x = rnd() % N, y = rnd() % M, z = rnd() % K;
        mx = max(mx, {{query(x, y, z), x, y, z}});
        if(ogq - Q == N * M * K) break;
    }
    int x = mx[1], y = mx[2], z = mx[3];
    while(Q) {
        mx = max(mx, {{query(x + 1, y, z), x + 1, y, z}});
        if(!Q) break;
        mx = max(mx, {{query(x - 1, y, z), x - 1, y, z}});
        if(!Q) break;
        mx = max(mx, {{query(x, y + 1, z), x, y + 1, z}});
        if(!Q) break;
        mx = max(mx, {{query(x, y - 1, z), x, y - 1, z}});
        if(!Q) break;
        mx = max(mx, {{query(x, y, z + 1), x, y, z + 1}});
        if(!Q) break;
        mx = max(mx, {{query(x, y, z - 1), x, y, z - 1}});
        if(mx[0] == query(x, y, z)) break;
        x = mx[1], y = mx[2], z = mx[3];
    }
    guess(x, y, z);
}

Compilation message (stderr)

worm.cpp: In function 'int query(int, int, int)':
worm.cpp:32:20: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   32 |         (void)scanf("%d", &ans);
      |               ~~~~~^~~~~~~~~~~~
worm.cpp: In function 'int main()':
worm.cpp:61:20: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   61 |         (void)scanf("%d %d %d %d", &N, &M, &K, &Q);
      |               ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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