Submission #396355

#	Time	Username	Problem	Language	Result	Execution time	Memory
396355		MarcoMeijer	Aliens (IOI07_aliens)	C++14	50 / 100	5 ms	256 KiB

aliens

#include <bits/stdc++.h>
using namespace std;
 
// macros
typedef long long ll;
typedef long double ld;
typedef pair<int, int> ii;
typedef pair<ll, ll> lll;
typedef tuple<int, int, int> iii;
typedef vector<int> vi;
typedef vector<ii> vii;
typedef vector<iii> viii;
typedef vector<ll> vll;
typedef vector<lll> vlll;
#define REP(a,b,c) for(int a=int(b); a<int(c); a++)
#define RE(a,c) REP(a,0,c)
#define RE1(a,c) REP(a,1,c+1)
#define REI(a,b,c) REP(a,b,c+1)
#define REV(a,b,c) for(int a=int(c-1); a>=int(b); a--)
#define FOR(a,b) for(auto& a : b)
#define all(a) a.begin(), a.end()
#define INF 1e18
#define EPS 1e-9
#define pb push_back
#define popb pop_back
#define fi first
#define se second
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
 
// input
template<class T> void IN(T& x) {cin >> x;}
template<class H, class... T> void IN(H& h, T&... t) {IN(h); IN(t...); }
 
// output
template<class T1, class T2> void OUT(const pair<T1,T2>& x);
template<class T> void OUT(const vector<T>& x);
template<class T> void OUT(const T& x) {cout << x;}
template<class H, class... T> void OUT(const H& h, const T&... t) {OUT(h); OUT(t...); }
template<class T1, class T2> void OUT(const pair<T1,T2>& x) {OUT(x.fi,' ',x.se);}
template<class T> void OUT(const vector<T>& x) {RE(i,x.size()) OUT(i==0?"":" ",x[i]);}
template<class... T> void OUTL(const T&... t) {OUT(t..., "\n"); }
template<class H> void OUTLS(const H& h) {OUTL(h); }
template<class H, class... T> void OUTLS(const H& h, const T&... t) {OUT(h,' '); OUTLS(t...); }
 
// dp
template<class T> bool ckmin(T&a, T&b) { bool bl = a > b; a = min(a,b); return bl;}
template<class T> bool ckmax(T&a, T&b) { bool bl = a < b; a = max(a,b); return bl;}
 
void program();
int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    program();
}
 
 
//===================//
//   begin program   //
//===================//
 
const int MX = 200;
const int N = (1<<20);

ll n, m;
ll X0, Y0;
char a[MX][MX];

bool query(ll x, ll y) {
    if(x > n || y > n || x <= 0 || y <= 0) return 0;
    #ifdef DEBUG
    return a[y-1][x-1]=='1';
    #endif
    OUTLS("examine",x,y);
    cout.flush();
    string res; IN(res);
    return res == "true";
}
void answer(ll x, ll y) {
    OUTLS("solution",x,y);
    cout.flush();
}
void goLeft() {
    REV(i,0,31) while(query(X0-(1ll<<i), Y0)) X0 -= (1ll<<i);
}
void goRight() {
    REV(i,0,31) while(query(X0+(1ll<<i), Y0)) X0 += (1ll<<i);
}
void goUp() {
    REV(i,0,31) while(query(X0, Y0-(1ll<<i))) Y0 -= (1ll<<i);
}
void goDown() {
    REV(i,0,31) while(query(X0, Y0+(1ll<<i))) Y0 += (1ll<<i);
}

bool checkM(int m) {
    RE(i,5) RE(j,5) {
        if((i+j)%2) continue;
        if(!query(X0+i*m,Y0+j*m)) return false;
    }
    return true;
}

void program() {
    IN(n,X0,Y0);
    #ifdef DEBUG
    RE(i,n) RE(j,n) IN(a[i][j]);
    #endif
    goLeft();
    goUp();
    // we are currently in a top left cell
    int tlX=X0, tlY=Y0;
    goRight();
    vll possibleM;
    possibleM.pb((X0-tlX+1)/1);
    possibleM.pb((X0-tlX+1)/3);
    possibleM.pb((X0-tlX+1)/5);
    goLeft();

    FOR(m,possibleM) {
        goUp();
        goLeft();
        while(query(X0-m, Y0-m)) X0-=m, Y0-=m;
        while(query(X0-m*2, Y0)) X0-=m*2;
        while(query(X0, Y0-m*2)) Y0-=m*2;
    }

    // we are now at THE top left cell
    FOR(m,possibleM) if(checkM(m)) {
        // we found the value of m
        answer(X0 + 2*m + m/2,Y0 + 2*m + m/2);
        return;
    }

    OUTL("No solution");
}

Compilation message (stderr)

aliens.cpp: In function 'void program()':
aliens.cpp:112:17: warning: unused variable 'tlY' [-Wunused-variable]
  112 |     int tlX=X0, tlY=Y0;
      |                 ^~~

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