Submission #827697

#	Time	Username	Problem	Language	Result	Execution time	Memory
827697		nnin	Aliens (IOI07_aliens)	C++14	0 / 100	1 ms	208 KiB

aliens

#include<bits/stdc++.h>
#define ll long long
#define pii pair<int,int>
#define f first
#define s second
using namespace std;

int n, x, y, m;

bool interact(int xx, int yy) {
    if(xx==x && yy==y) return 1;
    printf("examine %d %d\n", xx, yy);
    string s;
    cin>>s;
    return s[0]=='t';
}

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cin>>n>>x>>y;
    int l, r;

    l = 1;
    r = x;
    while(l<r) {
        int mid = (l+r)/2;
        if(interact(mid, y)) r = mid;
        else l = mid+1;
    }
    int left = l;

    l = x;
    r = n;
    while(l<r) {
        int mid = (l+r+1)/2;
        if(interact(mid, y)) l = mid;
        else r = mid-1;
    }
    int right = l;

    l = 1;
    r = y;
    while(l<r) {
        int mid = (l+r)/2;
        if(interact(x, mid)) r = mid;
        else l = mid+1;
    }
    int bottom = l;

    l = y;
    r = n;
    while(l<r) {
        int mid = (l+r+1)/2;
        if(interact(x, mid)) l = mid;
        else r = mid-1;
    }
    int top = l;

    int disl, disr;
    int mid = (left+x)/2;
    if(interact(mid, y)) {
        mid = (mid+left)/2;
        if(interact(mid, y)) {
            disl = 0;
        } else {
            disl = 4;
        }
    } else {
        disl = 2;
    }
    mid = (right+x)/2;
    if(interact(mid, y)) {
        mid = (mid+right)/2;
        if(interact(mid, y)) {
            disr = 0;
        } else {
            disr = 4;
        }
    } else {
        disr = 2;
    }

    m = (right+1-left)/(disl+disr+1);
    left += disl*m;
    right -= disr*m;

    mid = (bottom+y)/2;
    if(interact(x, mid)) {
        mid = (mid+bottom)/2;
        if(!interact(x, mid)) {
            bottom += 4*m;
        }
    } else {
        bottom += 2*m;
    }
    mid = (top+y)/2;
    if(interact(x, mid)) {
        mid = (mid+top)/2;
        if(!interact(x, mid)) {
            top -= 4*m;
        }
    } else {
        top -= 2*m;
    }

    int xc = (left+right)/2;
    int yc = (top+bottom)/2;

    if(xc+(4*m)<=n && interact(xc+(4*m), yc)) {
        xc += 2*m;
        if(yc+(4*m)<=n && interact(xc, yc+(4*m))) {
            yc += 2*m;
        } else if(yc-(4*m)>=1 && interact(xc, yc-(4*m))) {
            yc -= 2*m;
        }
    } else if(xc-(4*m)>=1 && interact(xc-(4*m), yc)) {
        xc -= 2*m;
        if(yc+(4*m)<=n && interact(xc, yc+(4*m))) {
            yc += 2*m;
        } else if(yc-(4*m)>=1 && interact(xc, yc-(4*m))) {
            yc -= 2*m;
        }
    } else if(xc+(2*m)<=n && xc-(2*m)>=1) {
        bool bl = interact(xc-(2*m), yc);
        bool br = interact(xc+(2*m), yc);
        if(bl && !br) {
            xc -= m;
            if(yc+(3*m)<=n && interact(xc, yc+(3*m))) {
                yc += m;
            } else if(yc-(3*m)>=1 && interact(xc, yc-(3*m))) {
                yc -= m;
            }
        } else if(br && !bl) {
            xc += m;
            if(yc+(3*m)<=n && interact(xc, yc+(3*m))) {
                yc += m;
            } else if(yc-(3*m)>=1 && interact(xc, yc-(3*m))) {
                yc -= m;
            }
        }
    }

    printf("solution %d %d", xc, yc);
}

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