Submission #469822

#	Time	Username	Problem	Language	Result	Execution time	Memory
469822		Ozy	Worm Worries (BOI18_worm)	C++17	0 / 100	31 ms	8584 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 ifil, lli ffil, lli icol, lli fcol) {

    lli mitadf, updown, mitadc,ant,mayor = 0;
    pair<lli,lli> coord;

    if (ifil == ffil && icol == fcol) return {ifil,icol};

    mitadc = (icol+fcol)/2;
    rep(i,ifil,ffil) {
        if (arr[i][mitadc] == 0) arr[i][mitadc] = query(i,mitadc);
        if (arr[i][mitadc] > mayor) {
            mayor = arr[i][mitadc];
            coord = {i,mitadc};
        }
    }
    pair<lli,lli> x = checa(coord);

    if (x.first == -1) return coord;
    if (x.second == 1) icol = mitadc+1;
    else fcol = mitadc-1;

    ant = mayor;

    mitadf = (ifil+ffil)/2;
    rep(i,icol,fcol) {
        if (arr[mitadf][i] == 0) arr[mitadf][i] = query(mitadf,i);
        if (arr[mitadf][i] > mayor) {
            mayor = arr[mitadf][i];
            coord = {mitadf,i};
        }
    }

    if (mayor == ant){
        if (coord.first > mitadf) ifil = mitadf+1;
        else ffil = mitadf-1;
    }
    else {
        pair<lli,lli> y = checa(coord);

        if (y.first == -1) return coord;
        if (y.second == 0) ffil = mitadf-1;
        else ifil =  mitadf+2;
    }

    return binaria(ifil,ffil,icol,fcol);
}

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

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

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

Compilation message (stderr)

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)':
worm.cpp:53:17: warning: unused variable 'updown' [-Wunused-variable]
   53 |     lli mitadf, updown, mitadc,ant,mayor = 0;
      |                 ^~~~~~
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};
      |                       ^

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