Submission #1154627

#	Time	Username	Problem	Language	Result	Execution time	Memory
1154627		thelegendary08	Aliens (IOI07_aliens)	C++17	0 / 100	0 ms	436 KiB

aliens

#include<bits/stdc++.h>
#define pb push_back
#define mp make_pair
#define int long long
#define vi vector<int>
#define vvi vector<vector<int>>
#define pii pair<int, int>
#define vpii vector<pair<int, int>>
#define vc vector<char>
#define vb vector<bool>
#define mii map<int,int>
#define f0r(i,n) for(int i=0;i<n;i++)
#define FOR(i,k,n) for(int i=k;i<n;i++)
#define all(v) (v).begin(),(v).end()
#define rall(v) (v).rbegin(),(v).rend()
#define in(a) int a; cin>>a
#define in2(a,b) int a,b; cin>>a>>b
#define in3(a,b,c) int a,b,c; cin>>a>>b>>c
#define in4(a,b,c,d) int a,b,c,d; cin>>a>>b>>c>>d
#define vin(v,n); vi v(n); f0r(i,n){cin>>v[i];}
#define out(a) cout<<a<<'\n'
#define out2(a,b) cout<<a<<' '<<b<<'\n'
#define out3(a,b,c) cout<<a<<' '<<b<<' '<<c<<'\n'
#define out4(a,b,c,d) cout<<a<<' '<<b<<' '<<c<<' '<<d<<'\n'
#define vout(v) for(auto u : v){cout<<u<<' ';} cout<<'\n'
#define dout(a) cout<<a<<' '<<#a<<'\n'
#define dout2(a,b) cout<<a<<' '<<#a<<' '<<b<<' '<<#b<<'\n'
#define yn(x); if(x){cout<<"YES"<<'\n';}else{cout<<"NO"<<'\n';}
const int leg = 1e9 + 7;
const int mod = 998244353;
using namespace std;
bool ask(int x, int y){
    cout<<"examine "<<x<<' '<<y<<endl;
    string a;
    cin>>a;
    return (a == "true");
}
void answer(int x, int y){
    cout<<"solution "<<x<<' '<<y<<endl;
}
signed main(){
	ios::sync_with_stdio(false);
	cin.tie(NULL);
	//ifstream cin(".in");
	//ofstream cout(".out");
	in3(n,x,y);
	int l = x;
	int r = n;
	while(l < r){
        int mid = l + (r - l + 1) / 2;
        bool b = ask(mid, y);
        if(!b){
            r = mid - 1;
        }
        else{
            int m2 = (x + mid) / 2;
            b = ask((x + mid) / 2, y);
            if(!b){
                r = (x + mid) / 2 - 1;
            }
            else{
                b = ask((x + m2) / 2, y);
                if(!b){
                    r = (x + m2) / 2 - 1;
                }
                else{
                    l = mid;
                }
            }
        }
	}
	int lx = l;
	l = 1;
	r = x;
	while(l < r){
        int mid = (l + r) / 2;
        bool b = ask(mid, y);
        if(!b){
            l = mid + 1;
        }
        else{
            int m2 = (x + mid) / 2;
            b = ask((x + mid) / 2, y);
            if(!b){
                l = (x + mid) / 2 + 1;
            }
            else{
                b = ask((x + m2) / 2, y);
                if(!b){
                    l = (x + m2) / 2 + 1;
                }
                else{
                    r = mid;
                }
            }
        }
	}
	int rx = l;
	int m = (rx - lx + 1);
	int lo = y;
	int hi = min(n, y + m);
	while(lo < hi){
        int mid = lo + (hi - lo + 1) / 2;
        bool b = ask(x, mid);
        if(b){
            lo = mid;
        }
        else{
            hi = mid - 1;
        }
	}
	int ry = lo;
	l = max(0LL, y-m);
	r = y;
	while(l < r){
        int mid = (l + r) / 2;
        bool b = ask(x, mid);
        if(b){
            hi = mid;
        }
        else{
            lo = mid + 1;
        }
	}
	int ly = lo;
	/*
    int lx = x;
    int rx = x;
    int cur = x-1;
    while(cur > 0){
        bool b = ask(cur, y);
        if(b){
            lx = cur;
            cur--;
        }
        else break;
    }
    cur = x+1;
    while(cur <= n){
        bool b = ask(cur, y);
        if(b){
            rx = cur;
            cur++;
        }
        else break;
    }
    int ly = y;
    int ry = y;
    cur = y-1;
    while(cur > 0){
        bool b = ask(x, cur);
        if(b){
            ly = cur;
            cur--;
        }
        else break;
    }
    cur = y+1;
    while(cur <= n){
        bool b = ask(x, cur);
        if(b){
            ry = cur;
            cur++;
        }
        else break;
    }
    */
    pii mid = mp((lx + rx) / 2, (ly + ry) / 2);
    lx = mid.first;
    rx = mid.first;
    int cur = mid.first-m*2;
    while(cur > 0){
        bool b = ask(cur, mid.second);
        if(b){
            lx = cur;
            cur-=m*2;
        }
        else break;
    }
    cur = mid.first+m*2;
    while(cur <= n){
        bool b = ask(cur, mid.second);
        if(b){
            rx = cur;
            cur+=m*2;
        }
        else break;
    }
    ly = mid.second;
    ry = mid.second;
    cur = mid.second-m*2;
    while(cur > 0){
        bool b = ask(mid.first, cur);
        if(b){
            ly = cur;
            cur-=m*2;
        }
        else break;
    }
    cur = mid.second+m*2;
    while(cur <= n){
        bool b = ask(mid.first, cur);
        if(b){
            ry = cur;
            cur+=m*2;
        }
        else break;
    }
    answer((lx + rx) / 2, (ly + ry) / 2);

}

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• Subtask 2: 0 / 10
• Subtask 3: 0 / 10
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• Subtask 10: 0 / 10