This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include<bits/stdc++.h>
#define int 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 %lld %lld\n", xx, yy);
string s;
cin>>s;
return s[0]=='t';
}
int32_t main() {
ios_base::sync_with_stdio(false);
cin.tie(NULL);
cin>>n>>x>>y;
int l, r, two;
two = 1;
while(x+two<=n && interact(x+two, y)) two *= 2;
l = x+(two/2);
r = min(x+two, n);
while(l<r) {
int mid = (l+r+1)/2;
if(interact(mid, y)) l = mid;
else r = mid-1;
}
int right = l;
two = 1;
while(x-two>=1 && interact(x-two, y)) two *= 2;
l = max(x-two, (int)1);
r = x-(two/2);
while(l<r) {
int mid = (l+r)/2;
if(interact(mid, y)) r = mid;
else l = mid+1;
}
int left = l;
two = 1;
while(y+two<=n && interact(x, y+two)) two *= 2;
l = y+(two/2);
r = min(y+two, n);
while(l<r) {
int mid = (l+r+1)/2;
if(interact(x, mid)) l = mid;
else r = mid-1;
}
int top = l;
two = 1;
while(y-two>=1 && interact(x, y-two)) two *= 2;
l = max(y-two, (int)1);
r = y-(two/2);
while(l<r) {
int mid = (l+r)/2;
if(interact(x, mid)) r = mid;
else l = mid+1;
}
int bottom = l;
m = right+1-left;
int xc = (left+right)/2;
int yc = (top+bottom)/2;
while(xc-m>=1 && yc-m>=1 && interact(xc-m, yc-m)) {
xc -= m;
yc -= m;
}
while(xc-(2*m)>=1 && interact(xc-(2*m), yc)) xc -= 2*m;
while(yc-(2*m)>=1 && interact(xc, yc-(2*m))) yc -= 2*m;
xc += 2*m;
yc += 2*m;
printf("solution %lld %lld", xc, yc);
}
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