Submission #716079

#	Time	Username	Problem	Language	Result	Execution time	Memory
716079		Charizard2021	Worm Worries (BOI18_worm)	C++17	49 / 100	751 ms	288 KiB

worm

#include<bits/stdc++.h>
using namespace std;
int n, m, k, maxq;
int value(int x, int y, int z){
	if(x <= 0 || x > n || y <= 0 || y > m || z <= 0 || z > k){
        return 0;
    }
	cout << "? " << x << " " << y << " " << z << endl;
	int ans;
	cin >> ans;
	if (ans == -1){
        exit(0);
    }
	return ans;
}
int dx[] = {1, -1, 0, 0, 0, 0};
int dy[] = {0, 0, 1, -1, 0, 0};
int dz[] = {0, 0, 0, 0, 1, -1};
int main(){
	cin >> n >> m >> k >> maxq;
    if(m != 1 || k != 1){
        int samples = maxq / 2;
        int record = 0;
        int x = -1, y = -1, z = -1;
        for(int i = 0; i < samples; i++){
            int a = 1 + rand() % n;
            int b = 1 + rand() % m;
            int c = 1 + rand() % k;
            int res = value(a, b, c);
            if(res > record){
                record = res;
                x = a, y = b, z = c;
            }
        }
        int walked = 0;
        vector<bool> tried(6, false);
        while (true) {
            int left = 0;
            for(int i = 0; i < 6; i++){
                left += (int)!tried[i];
            }
            if(left == 0){
                cout << "! " << x << ' ' << y << ' ' << z << endl;
                return 0;
            }
            int r = rand() % left;
            for(int i = 0; i < 6; i++){
                if(!tried[i]){
                    if(r == 0){
                        int x1 = x + dx[i];
                        int	y1 = y + dy[i];
                        int	z1 = z + dz[i];
                        int res = value(x1, y1, z1);
                        if(res > record){
                            record = res;
                            x = x1;
                            y = y1;
                            z = z1;
                            for(int j = 0; j < 6; j++){
                                tried[j] = false;
                            }
                            tried[i ^ 1] = true;
                            walked++;
                            break;
                        }
                        else {
                            tried[i] = true;
                            break;
                        }
                    }
                    r--;
                }
            }
        }
    }
    else{
        int a = sqrt(n);
        int mx = 0, pos;
        for(int cur = 1; cur <= n; cur += a){
            cout << "? " << cur << " 1 1" << endl;
            int res;
            cin >> res;
            if (res == -1){
                exit(0);
            }
            if(res > mx){
                mx = res;
                pos = cur;
            }
        }

        int low, high;
        while(true){
            low = -1;
            high = -1;
            if(pos >= 2){
                cout << "? " << pos - 1 << " 1 1" << endl;
                cin >> low;
                if (low == -1){
                    exit(0);
                }
            }
            if(pos + 1 <= n){
                cout << "? " << pos + 1 << " 1 1" << endl;
                cin >> high;
                if (high == -1){
                    exit(0);
                }
            }
            if(low > mx){
                mx = low;
                pos = pos - 1;
            }
            if(high > mx){
                mx = high;
                pos = pos + 1;
            }
            cout << "! " << pos << " 1 1" << endl;
        }
    }
}

Compilation message (stderr)

worm.cpp: In function 'int main()':
worm.cpp:104:44: warning: 'pos' may be used uninitialized in this function [-Wmaybe-uninitialized]
  104 |                 cout << "? " << pos + 1 << " 1 1" << endl;
      |                                            ^~~~~~

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