Submission #441593

#	Time	Username	Problem	Language	Result	Execution time	Memory
441593		Haruto810198	Worm Worries (BOI18_worm)	C++17	32 / 100	499 ms	992492 KiB

worm

#include <bits/stdc++.h>

using namespace std;

#define int long long
#define double long double

#define FOR(i, l, r, d) for(int i=(l); i<=(r); i+=(d))
#define szof(x) ((int)(x).size())

#define vi vector<int>
#define pii pair<int,int>

#define F first
#define S second

#define pb push_back
#define eb emplace_back
#define mkp make_pair

const int INF = 2147483647;
const int LNF = INF*INF;
const int MOD = 1000000007;
const int mod = 998244353;
const double phi = (sqrt(5) + 1) / 2.0;

//#pragma GCC optimize("Ofast")
//#pragma GCC optimize("unroll-loops")

int X, Y, Z;
int Q;

vector<vector<vi>> arr;

int query(int x, int y, int z){

    int ret;

    if(x<=0 or x>=X+1 or y<=0 or y>=Y+1 or z<=0 or z>=Z+1){
        return 0;
    }

    if(Q == 0){
        return -1;
    }

    if(arr[x][y][z] == 0){
        Q--;
        cout<<"? "<<x<<" "<<y<<" "<<z<<endl;
        cin>>ret;
        arr[x][y][z] = ret;
    }
    else{
        ret = arr[x][y][z];
    }

    return ret;

}

int solve_1D(int L, int R, int mid){

    //cerr<<"solve("<<L<<", "<<R<<", "<<mid<<") "<<endl;

    if(L == R) return L;

    int ml = L + floor((R-L) * (2-phi));
    int mr = R - floor((R-L) * (2-phi));

    //assert(ml <= mr);

    if( mid*2 < L+R ){
        ml = mid;
    }
    else{
        mr = mid;
    }

    //assert(ml <= mr);

    int vl = query(ml, 1, 1);
    int vr = query(mr, 1, 1);

    if(vl > vr){
        return solve_1D(L, mr - 1, ml);
    }
    else{
        return solve_1D(ml + 1, R, mr);
    }

}

bool isMax(int x, int y, int z){

    bool ret = 1;

    FOR(i, -1, 1, 2){
        FOR(j, -1, 1, 2){
            FOR(k, -1, 1, 2){
                if( query(x, y, z) < query(x+i, y+j, z+k) ){
                    ret = 0;
                }
            }
        }
    }

    return ret;

}

pii solve_2D(int xL, int xR, int yL, int yR){

    if(xR-xL<=1 and yR-yL<=1){
        FOR(i, xL, xR, 1){
            FOR(j, yL, yR, 1){
                if(isMax(i, j, 1)){
                    return mkp(i, j);
                }
            }
        }
    }

    if(xR-xL > yR-yL){ /// cut x

        int xmid = (xL + xR) / 2;
        int Max = -INF, pos_y;

        FOR(i, yL, yR, 1){
            int tmp = query(xmid, i, 1);
            if(tmp > Max){
                Max = tmp;
                pos_y = i;
            }
        }

        int vl = query(xmid-1, pos_y, 1);
        int vr = query(xmid+1, pos_y, 1);

        if(Max>=vl and Max>=vr){
            return mkp(xmid, pos_y);
        }
        else if(vl > vr){
            return solve_2D(xL, xmid, yL, yR);
        }
        else{
            return solve_2D(xmid, xR, yL, yR);
        }

    }
    else{ /// cut y

        int ymid = (yL + yR) / 2;
        int Max = -INF, pos_x;

        FOR(i, xL, xR, 1){
            int tmp = query(i, ymid, 1);
            if(tmp > Max){
                Max = tmp;
                pos_x = i;
            }
        }

        int vl = query(pos_x, ymid-1, 1);
        int vr = query(pos_x, ymid+1, 1);

        if(Max>=vl and Max>=vr){
            return mkp(pos_x, ymid);
        }
        else if(vl > vr){
            return solve_2D(xL, xR, yL, ymid);
        }
        else{
            return solve_2D(xL, xR, ymid, yR);
        }

    }

}

signed main(){

    //ios_base::sync_with_stdio(false);
    //cin.tie(0);
    //cout.tie(0);

    cin>>X>>Y>>Z>>Q;

    arr.resize(X + 1);
    for(auto& i : arr){
        i.resize(Y + 1);
        for(auto& j : i){
            j.resize(Z + 1);
        }
    }

    if(Y==1 and Z==1){
        int res = solve_1D(1, X, 1 + (X-1)*(phi-1));
        cout<<"! "<<res<<" 1 1"<<endl;
    }
    else if(Z==1){
        pii res = solve_2D(1, X, 1, Y);
        cout<<"! "<<res.F<<" "<<res.S<<" 1"<<endl;
    }
    else{

    }

    return 0;

}

Compilation message (stderr)

worm.cpp: In function 'std::pair<long long int, long long int> solve_2D(long long int, long long int, long long int, long long int)':
worm.cpp:39:5: warning: 'pos_x' may be used uninitialized in this function [-Wmaybe-uninitialized]
   39 |     if(x<=0 or x>=X+1 or y<=0 or y>=Y+1 or z<=0 or z>=Z+1){
      |     ^~
worm.cpp:153:25: note: 'pos_x' was declared here
  153 |         int Max = -INF, pos_x;
      |                         ^~~~~
worm.cpp:126:25: warning: 'pos_y' may be used uninitialized in this function [-Wmaybe-uninitialized]
  126 |         int Max = -INF, pos_y;
      |                         ^~~~~

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