Submission #1032927

#	Time	Username	Problem	Language	Result	Execution time	Memory
1032927		anango	Worm Worries (BOI18_worm)	C++17	59 / 100	720 ms	15720 KiB

worm

#include <bits/stdc++.h>
#define int long long
using namespace std;
int INF = 1LL<<30;
mt19937 rng;
vector<int> dx = {0,0,0,0,-1,1};
vector<int> dy = {0,0,-1,1,0,0};
vector<int> dz = {-1,1,0,0,0,0};

int n,m,k,q;

int qcount = 0;
int debug = 0;
vector<vector<vector<int>>> humidity;

vector<vector<int>> neighbours(vector<int> point) {
    vector<vector<int>> ans;
    for (int dir=0; dir<6; dir++) {
        int nx,ny,nz; nx=point[0]+dx[dir]; ny=point[1]+dy[dir]; nz=point[2]+dz[dir];
        if (!(1<=nx && nx<=n && 1<=ny && ny<=m && 1<=nz && nz<=k)) {
            continue;
        }
        ans.push_back({nx,ny,nz});
    }
    return ans;
}

map<vector<int>,int> cache;
int query(int x, int y, int z) {
    if (cache.count({x,y,z})) return cache[{x,y,z}];
    cout << "? " << x <<" " << y <<" " <<z << endl;
    qcount++;
    int an; 
    if (!debug) {
        cin >> an; 
    }
    else {
        cout << humidity[x-1][y-1][z-1] << endl;
        return cache[{x,y,z}] = humidity[x-1][y-1][z-1];
    }
    return cache[{x,y,z}] = an;
}

void answer(int x, int y, int z) {
    cout << "! " << x  << " " << y << " " << z << endl;
    if (debug) {
        cout << "in " << qcount <<" " << "queries" << endl;
        int gg=0;
        for (auto j:neighbours({x,y,z})) {
            if (humidity[j[0]-1][j[1]-1][j[2]-1]>humidity[x-1][y-1][z-1]) {
                gg=1;
            }
        }
        if (gg) {
            cout << "INCORRECT" << endl;
        }
        else {
            cout << "CORRECT" << endl;
        }
    }
}




signed main() {
    rng.discard((time(NULL))%100000);
    cin >> n >> m >> k >> q;
    if (debug) humidity = vector<vector<vector<int>>>(n,vector<vector<int>>(m,vector<int>(k,0)));
    if (debug) {
        for (int i=0; i<n; i++) {
            for (int j=0; j<m; j++) {
                for (int k1=0; k1<k; k1++) {
                    humidity[i][j][k1]=rng();
                }
            }
        }
    }
    vector<vector<int>> points; //humidity,x,y,z
    int q1 = q/2;
    int q2 = q-q1;
    int pathlength = q2/6;
    for (int i=0; i<q1; i++) {
        int x,y,z; x=rng()%n; y=rng()%m; z=rng()%k; x++; y++; z++;
        points.push_back({query(x,y,z),x,y,z});
    }
    sort(points.begin(), points.end());
    reverse(points.begin(), points.end());
    int a,x,y,z;
    a = points[0][0]; x = points[0][1]; y = points[0][2]; z = points[0][3];
    while (1) {
        bool changed = 0;
        int ma=query(x,y,z);
        for (vector<int> j:neighbours({x,y,z})) {
            if (query(j[0],j[1],j[2])>ma) {
                x = j[0]; y=j[1]; z=j[2]; changed=1; ma=query(j[0],j[1],j[2]);
            }
        }
        if (!changed) break;
    }
    answer(x,y,z);
    
}

Compilation message (stderr)

worm.cpp: In function 'int main()':
worm.cpp:82:9: warning: unused variable 'pathlength' [-Wunused-variable]
   82 |     int pathlength = q2/6;
      |         ^~~~~~~~~~
worm.cpp:89:9: warning: variable 'a' set but not used [-Wunused-but-set-variable]
   89 |     int a,x,y,z;
      |         ^

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