Submission #630970

#	Time	Username	Problem	Language	Result	Execution time	Memory
630970		ttamx	Aliens (IOI07_aliens)	C++14	20 / 100	4 ms	320 KiB

aliens

#include<bits/stdc++.h>

using namespace std;

int n,xi,yi;

bool examine(int x,int y){
    if(x<=0||y<=0||x>n||y>n)return 0;
    cout << "examine " << x << " " << y << endl;
    string ret;
    cin >> ret;
    return (ret=="true");
}

int main(){
    cin.tie(nullptr)->sync_with_stdio(false);
    cin >> n >> xi >> yi;
    int l=xi,r=n;
    for(int i=3;xi+i<=n;i*=2){
        if(examine(xi+i,yi)){
            l=xi+i;
        }else{
            r=xi+i;
            break;
        }
    }
    while(l<r){
        int mid=(l+r)/2;
        if(examine(mid,yi))l=mid;
        else r=mid-1;
    }
    int xr=l;
    l=1,r=xi;
    for(int i=3;xi-i>0;i*=2){
        if(examine(xi-i,yi)){
            r=xi-i;
        }else{
            l=xi-i;
            break;
        }
    }
    while(l<r){
        int mid=(l+r)/2;
        if(examine(mid,yi))r=mid;
        else l=mid+1;
    }
    int xl=r;
    int sz=xr-xl+1;
    l=yi,r=n;
    for(int i=3;yi+i<=n;i*=2){
        if(examine(xi,yi+i)){
            l=yi+i;
        }else{
            r=yi+i;
            break;
        }
    }
    while(l<r){
        int mid=(l+r)/2;
        if(examine(xi,mid))l=mid;
        else r=mid-1;
    }
    int yr=l;
    int xm=(xr+xl)/2;
    int ym=yr-(sz/2);
    int L=xm-(2*sz),R=xm+(2*sz),T=ym+(2*sz),B=ym-(2*sz);
    while(examine(L,ym))L-=2*sz;
    while(examine(R,ym))R+=2*sz;
    while(examine(xm,B))B-=2*sz;
    while(examine(xm,T))T+=2*sz;
    cout << "solution " << (L+R)/2 << " " << (T+B)/2;
}

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