Submission #505689

#	Time	Username	Problem	Language	Result	Execution time	Memory
505689		wiwiho	Worm Worries (BOI18_worm)	C++14	24 / 100	1335 ms	9784 KiB

worm

#include <bits/stdc++.h>
 
#define eb emplace_back
#define mt make_tuple
#define mp make_pair
#define F first
#define S second
#define printv(a, b) { \
    for(auto pv : a) b << pv << " "; \
    b << "\n"; \
}
 
using namespace std;
 
using pii = pair<int, int>;
using tiii = tuple<int, int, int>;
 
const int MAX = 1e9;
 
mt19937 rnd(48763);
 
int n, m, k;
 
map<tiii, int> _qry;
int cnt = 0;
int query(int x, int y, int z){
    if(x <= 0 || x > n || y <= 0 || y > m || z <= 0 || z > k) return 0;
    if(_qry.find(mt(x, y, z)) == _qry.end()){
        cout << "? " << x << " " << y << " " << z << "\n" << flush;
        int r = 0;
        cin >> r;
        if(r == -1) exit(0);
        _qry[mt(x, y, z)] = r;
        cnt++;
    }
    return _qry[mt(x, y, z)];
}

int findmx1(int y, int z){
    int x = -1, mx = -1;
    for(int i = 1; i <= n; i++){
        int tmp = query(i, y, z);
        if(tmp > mx) mx = tmp, x = i;
    }
    return x;
}
 
pii findmx2(int z){
    int x = -1, y = -1, mx = -1;
    for(int i = 1; i <= n; i++){
        for(int j = 1; j <= m; j++){
            int tmp = query(i, j, z);
            if(tmp > mx) mx = tmp, x = i, y = j;
        }
    }
    return mp(x, y);
}
 
int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(0);
 
    int q;
    cin >> n >> m >> k >> q;
 
    int x, y, z;
    if(m == 1 && k == 1){
        int l = 1, r = n;
        while(l < r){
            int mid = (l + r) / 2;
            query(mid, 1, 1);
            query(mid + 1, 1, 1);
            //cerr << l << " " << r << " " << mid << " " << query(mid, 1, 1) << " " << query(mid + 1, 1, 1) << "\n";
            if(query(mid, 1, 1) < query(mid + 1, 1, 1)) l = mid + 1;
            else r = mid;
        }
        x = l; y = 1; z = 1;
    }
    else if(k == 1){
        int l = 1, r = m;
        while(l < r){
            int mid = (l + r) / 2;
            int x = findmx1(mid, z);
            if(query(x, mid + 1, z) >= query(x, mid, z)) l = mid + 1;
            else if(query(x, mid - 1, z) >= query(x, mid, z)) r = mid - 1;
            else l = r = mid;
        }
        y = l;
        z = 1;
        x = findmx1(y, z);
    }
    else{
        int l = 1, r = k;
        while(l < r){
            int mid = (l + r) / 2;
            int x, y;
            tie(x, y) = findmx2(mid);
            if(query(x, y, mid + 1) >= query(x, y, mid)) l = mid + 1;
            else if(query(x, y, mid - 1) >= query(x, y, mid)) r = mid - 1;
            else l = r = mid;
        }
        z = l;
        tie(x, y) = findmx2(z);
    }
 
    cout << "! " << x << " " << y << " " << z << "\n";
 
    return 0;
}

Compilation message (stderr)

worm.cpp: In function 'int main()':
worm.cpp:27:43: warning: 'z' may be used uninitialized in this function [-Wmaybe-uninitialized]
   27 |     if(x <= 0 || x > n || y <= 0 || y > m || z <= 0 || z > k) return 0;
      |        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~
worm.cpp:66:15: note: 'z' was declared here
   66 |     int x, y, z;
      |               ^

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