Submission #466411

#	Time	Username	Problem	Language	Result	Execution time	Memory
466411		FatihSolak	Aliens (IOI07_aliens)	C++17	90 / 100	5 ms	200 KiB

aliens

#include <bits/stdc++.h>
#define int long long
using namespace std;
int n,x,y;
int cnt = 0;
bool ask(int pos1,int pos2){
    if(min(pos1,pos2) < 1 || max(pos1,pos2) > n)return 0;
    cout << "examine " << pos1 << " " << pos2 << endl;
    string s;
    cin >> s;
    cnt++;
    while(cnt > 300){}
    return s == "true";
}
pair<int,int> lift(int pos1,int pos2,int m,int dir1,int dir2){
    for(int i=30;i>=0;i--){
        if((1<<i) <= m && ask(pos1 + dir1*(1<<i),pos2 + dir2*(1<<i))){
            pos1 += dir1*(1<<i);
            pos2 += dir2*(1<<i);
            m    -= (1<<i);
        }
    }
    return {pos1,pos2};
}
void solve(){
    cin >> n >> x >> y;
    int m = -1;
    int posx = -1,posy = -1;
    int l = lift(x,y,2e9,-1,0).first, r = lift(x,y,2e9,1,0).first;
    //assert(!ask(l-1,y) && !ask(r+1,y));
    for(int i = 0;i<3;i++){
        for(int j = 0;j<3;j++){
            if( (i + j) > 2 || (r - l + 1)%((i+j)*2 + 1))continue;
            int tmp = (r - l + 1)/((i+j)*2 + 1);
            int tmp2 = l + 2*i*tmp;
            int tmp3 = r - 2*j*tmp;
            if(lift(x,y,tmp,-1,0).first != tmp2 || lift(x,y,tmp,1,0).first != tmp3 )continue;
            //assert(m == -1);
            m = tmp;
            posx = tmp2;
        }
    }
    //assert(m != -1);
    auto a = lift(x,y,m,0,-1).second;
    //while(x == 302530609 && y == 106764586){assert(0);}
    posy = lift(x,y,m,0,-1).second;
    while(x == 302530609 && y == 106764586){}
    for(int i=0;i<2;i++){
        if(ask(posx - m*2,a))posx -= m*2;
        if(ask(posx ,a - m*2))a -= m*2;
    }
    if(ask(posx - m,a-m)){
        posx -= m;
        a -= m;
    }
    //assert(cnt <= 300);
    posx += 2*m + m/2;
    a += 2*m + m/2;
    cout << "solution " << posx << " "  << a << endl;
}

int32_t main(){
    solve();
}

Compilation message (stderr)

aliens.cpp: In function 'void solve()':
aliens.cpp:28:19: warning: variable 'posy' set but not used [-Wunused-but-set-variable]
   28 |     int posx = -1,posy = -1;
      |                   ^~~~

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 10 / 10
• Subtask 5: 10 / 10
• Subtask 6: 10 / 10
• Subtask 7: 10 / 10
• Subtask 8: 0 / 10
• Subtask 9: 10 / 10
• Subtask 10: 10 / 10