Submission #470080

#	Time	Username	Problem	Language	Result	Execution time	Memory
470080		Ozy	Worm Worries (BOI18_worm)	C++17	31 / 100	51 ms	3012 KiB

worm

#include <iostream>
#include <bits/stdc++.h>
using namespace std;
#define rep(i,a,b) for (int i = (a); i <= (b); i++)
#define repa(i,a,b) for (int i = (a); i >= (b); i--)
#define lli long long int
#define debug(a) cout << #a << " = " << a << endl
#define debugsl(a) cout << #a << " = " << a << ", "

#define MAX 1000

lli n,m,k,q;
pair<lli,lli> res;
lli dir[8] = {-1,0,1,0,0,1,0,-1};
lli arr[MAX+2][MAX+2];

lli query(lli x, lli y) {

    cout << "? " << x << ' ' << y << " 1" << endl;

    lli a;
    cin >> a;
    return a;
}

pair<lli,lli> checa(pair<lli,lli> coord) {

    lli sector,val = arr[coord.first][coord.second];
    pair<lli,lli> nuevo;

    rep(i,0,3) {
        nuevo = coord;
        nuevo.first += dir[i];
        nuevo.second += dir[i+4];

        if (nuevo.first == 0 || nuevo.first == n+1) continue;
        if (nuevo.second == 0 || nuevo.second == m+1) continue;

        if (arr[nuevo.first][nuevo.second] == 0) arr[nuevo.first][nuevo.second] = query(nuevo.first, nuevo.second);
        if (arr[nuevo.first][nuevo.second] > val) {
            val = arr[nuevo.first][nuevo.second];
            sector = i;
        }
    }

    if (val == arr[coord.first][coord.second]) return{-1,0};
    return {val,sector};

}

pair<lli,lli> binaria(lli ini,lli fin, lli l, lli r, pair<lli,lli> ant, lli num) {

    lli mitad,mayor = 0;
    pair<lli,lli> coord;

    if (ini == fin && r == l) return {ini,r};

    lli a,b;
    mitad = (ini+fin)/2;
    if (num == 1) b = mitad;
    else a = mitad;

    rep(i,l,r) {

        if (num == 1) a = i;
        else b = i;

        if (arr[a][b] == 0) arr[a][b] = query(a,b);
        if (arr[a][b] > mayor) {
            mayor = arr[a][b];
            coord = {a,b};
        }
    }
    pair<lli,lli> x = checa(coord);

    if (x.first == -1) return coord;

    lli nuevo = num^1;
    if (arr[coord.first][coord.second] >= arr[ant.first][ant.second]) {

        if (x.second == 0 || x.second == 3) fin = mitad - 1;
        else ini = mitad + 1;

        return binaria(l,r,ini,fin,coord,nuevo);

    }
    else {

        if (num == 1) {

            if (ant.second > mitad) ini = mitad + 1;
            else fin = mitad-1;
        }
        else {

            if (ant.first > mitad) ini = mitad + 1;
            else fin = mitad-1;
        }

        return binaria(l,r,ini,fin,ant,nuevo);

    }

}

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    cin >> n >> m >> k >> q;

    res = binaria(1,n,1,m,{0,0},0);
    cout << "! " << res.first << ' ' << res.second << " 1";
}

Compilation message (stderr)

worm.cpp: In function 'std::pair<long long int, long long int> checa(std::pair<long long int, long long int>)':
worm.cpp:47:23: warning: 'sector' may be used uninitialized in this function [-Wmaybe-uninitialized]
   47 |     return {val,sector};
      |                       ^
worm.cpp: In function 'std::pair<long long int, long long int> binaria(long long int, long long int, long long int, long long int, std::pair<long long int, long long int>, long long int)':
worm.cpp:68:46: warning: 'b' may be used uninitialized in this function [-Wmaybe-uninitialized]
   68 |         if (arr[a][b] == 0) arr[a][b] = query(a,b);
      |                                         ~~~~~^~~~~
worm.cpp:68:46: warning: 'a' may be used uninitialized in this function [-Wmaybe-uninitialized]

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