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>
using namespace std;
int TIME = clock();
#define file \
freopen("in.txt" , "r" , stdin); \
freopen("out.txt" , "w" , stdout);
typedef long long ll;
void test_case () {
ll n , x , y;
cin >> n >> x >> y;
auto ask = [&](ll fi , ll se) -> int {
cout << "examine " << fi << " " << se << endl;
string as;
cin >> as;
return (as == "true");
};
ll l = 1, r = x , best[4] = {x , y , x , y};
while (l <= r) {
ll mid = (l + r) / 2LL;
if (ask(mid , y) == true && ask((mid + x) / 2LL , y) == true) {
best[0] = mid;
r = mid - 1;
} else {
l = mid + 1;
}
}
l = 1 , r = y;
while (l <= r) {
ll mid = (l + r) / 2LL;
if (ask(x , mid) == true && ask(x , (mid + y) / 2LL) == true) {
best[1] = mid;
r = mid - 1;
} else {
l = mid + 1;
}
}
l = x , r = n;
while (l <= r) {
ll mid = (l + r) / 2LL;
if (ask(mid , y) == true && ask((mid + x) / 2LL , y) == true) {
best[2] = mid;
l = mid + 1;
} else {
r = mid - 1;
}
}
l = y , r = n;
while (l <= r) {
ll mid = (l + r) / 2LL;
if (ask(x , mid) == true && ask(x , (mid + y) / 2LL) == true) {
best[3] = mid;
l = mid + 1;
} else {
r = mid - 1;
}
}
// cout << best[0] << " " << best[1] << " " << best[2] << " " << best[3] << endl;
// assert(best[2] - best[0] == best[3] - best[1]);
x = (best[0] + best[2]) / 2LL;
y = (best[1] + best[3]) / 2LL;
ll m1 = best[2] - best[0] + 1 , m2 = best[3] - best[1] + 1;
while (x - m1 > 0 && y - m2 > 0) {
if (ask(x - m1 , y - m2) == true) {
x -= m1;
y -= m2;
} else {
break;
}
}
while (x - m1 - m1 > 0) {
if (ask(x - m1 - m1 , y) == true) {
x -= m1 * 2LL;
} else {
break;
}
}
while (y - m2 - m2 > 0) {
if (ask(x , y - m2 - m2) == true) {
y -= m2 * 2LL;
} else {
break;
}
}
cout << "solution " << x + m1 + m1 << " " << y + m2 + m2 << endl;
}
int32_t main () {
// file
int t = 1;
// cin >> t;
while (t --) {
test_case();
}
cerr << "\nTime elapsed: " << (clock() - TIME) * 1000.0 / CLOCKS_PER_SEC << " ms\n";
return 0;
}
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