Submission #157355

#	Time	Username	Problem	Language	Result	Execution time	Memory
157355		my99n	Aliens (IOI07_aliens)	C++14	Compilation error	0 ms	0 KiB

aliens

#include<bits/stdc++.h>
#include"alienslib.h"
#include "alienslib.cpp"
using namespace std;

int n;

int bsearch (bool axis, bool high, int l, int r, int st){
    if (l == r) return l;
    if (high) {
        if (axis) {
            int mid = (l+r+1)/2;
            int res = examine(mid, st);
            assert(res != -1);
            if (res) return bsearch(axis, high, mid, r, st);
            else     return bsearch(axis, high, l, mid-1, st);
        }
        else {
            int mid = (l+r+1)/2;
            int res = examine(st, mid);
            assert(res != -1);
            if (res) return bsearch(axis, high, mid, r, st);
            else     return bsearch(axis, high, l, mid-1, st);
        }
    }
    else {
        if (axis) {
            int mid = (l+r)/2;
            int res = examine(mid, st);
            assert(res != -1);
            if (res) return bsearch(axis, high, l, mid, st);
            else     return bsearch(axis, high, mid+1, r, st);
        } 
        else {
            int mid = (l+r)/2;
            int res = examine(st, mid);
            assert(res != -1);
            if (res) return bsearch(axis, high, l, mid, st);
            else     return bsearch(axis, high, mid+1, r, st);
        }
    }
    return -1;
}

int bound (bool axis, bool high, int x, int y, int a = 1) {
    // if axis == 1, y must be static and vice versa
    if (x > n) return n;
    if (x <= 0) return 0;
    
    if (high) {
        // operator +
        if (axis) {
            int res = examine(x+a, y);
            assert(res != -1);
            if (res) return bound(axis, high, x+a, y, a<<1);
            else     return bsearch(axis, high, x, x+a, y);
        }
        else {
            int res = examine(x, y+a);
            assert(res != -1);
            if (res) return bound(axis, high, x, y+a, a<<1);
            else     return bsearch(axis, high, y, y+a, x);
        }
    }
    else {
        // operator -
        if (axis) {
            int res = examine(x-a, y);
            assert(res != -1);
            if (res) return bound(axis, high, x-a, y, a<<1);
            else     return bsearch(axis, high, x-a, x, y);
        }
        else {
            int res = examine(x, y-a);
            assert(res != -1);
            if (res) return bound(axis, high, x, y-a, a<<1);
            else     return bsearch(axis, high, y-a, y, x);
        }
    }
    return -1;
}

int main(){
    int x, y;
    get_size_and_start(n, x, y);
    int xh = bound(1, 1, x, y);
    int yh = bound(0, 1, x, y);
    int xl = bound(1, 0, x, y);
    int yl = bound(0, 0, x, y);
    int xc = (xh+xl+1)/2;
    int yc = (yh+yl+1)/2;
    // cerr << xc << ' ' << yc << endl;
    int size = xh-xl+1;
    assert(size == yh-yl+1);
    
    vector<pair<int,int>> around, twostep;
    for(int i = -1; i <= 1; i+=2){
        for(int j = -1; j <= 1; j+=2){
            if (examine(xc+i*size, yc+j*size) == 1) around.push_back({i, j});
            if (examine(xc+i*size*2, yc+j*size*2)) twostep.push_back({i, j});
        }
    }

    if (around.size() == 1) {
        solution(xc+around[0].first*size*2, yc+around[0].second*size*2);    
        return 0;
    }
    if (around.size() == 2) {
        if (around[0].first == around[1].first) {
            solution(xc+around[0].first*2*size, yc);
            return 0;
        }
        if (around[0].second == around[1].second) {
            solution(xc,around[0].second*2*size+yc);
            return 0;
        }
    }
    if (twostep.size() == 1) {
        solution(xc+twostep[0].first*size, yc+twostep[0].second*size);
        return 0;
    }
    else {
        solution(xc, yc);
        return 0;
    }
    assert(false);
    return 0;
}

Compilation message (stderr)

aliens.cpp:2:9: fatal error: alienslib.h: No such file or directory
 #include"alienslib.h"
         ^~~~~~~~~~~~~
compilation terminated.