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 "xylophone.h"
#include <bits/stdc++.h>
using namespace std;
int a[5001];
bool solved[5001];
void solve(int n) {
for (int i=0;i<5001;i++) {
a[i] = -1;
solved[i] = false;
}
int bottom = 1, top = n, middle, diff, diff2;
while (bottom + 1 < top) {
middle = (top + bottom) / 2;
diff = query(1, middle);
if (diff == n - 1) {
top = middle;
} else {
bottom = middle;
}
}
a[top] = n; solved[n] = true; answer(top, n);
if (top != n) {
a[top + 1] = n - query(top, top + 1);
solved[a[top + 1]] = true; answer(top + 1, a[top + 1]);
}
a[top - 1] = n - query(top - 1, top);
solved[a[top - 1]] = true; answer(top - 1, a[top - 1]);
for (int i=top+2;i<n+1;i++) {
diff = query(i - 1, i);
if (a[i - 1] - diff < 1 || solved[a[i - 1] - diff]) {
a[i] = a[i - 1] + diff;
} else if (a[i - 1] + diff > n || solved[a[i - 1] + diff]) {
a[i] = a[i - 1] - diff;
} else {
diff2 = query(i - 2, i);
if (a[i - 2] > a[i - 1]) {
if (diff2 == a[i - 2] - a[i - 1] + diff) {
a[i] = a[i - 1] - diff;
} else {
a[i] = a[i - 1] + diff;
}
} else {
if (diff2 == a[i - 1] - a[i - 2] + diff) {
a[i] = a[i - 1] + diff;
} else {
a[i] = a[i - 1] - diff;
}
}
}
solved[a[i]] = true; answer(i, a[i]);
}
for (int i=top-2;i>0;i--) {
diff = query(i, i + 1);
if (a[i + 1] - diff < 1 || solved[a[i - 1] - diff]) {
a[i] = a[i + 1] + diff;
} else if (a[i + 1] + diff > n || solved[a[i + 1] + diff]) {
a[i] = a[i + 1] - diff;
} else {
diff2 = query(i + 2, i);
if (a[i + 2] > a[i + 1]) {
if (diff2 == a[i + 2] - a[i + 1] + diff) {
a[i] = a[i + 1] - diff;
} else {
a[i] = a[i + 1] + diff;
}
} else {
if (diff2 == a[i + 1] - a[i + 2] + diff) {
a[i] = a[i + 1] + diff;
} else {
a[i] = a[i + 1] - diff;
}
}
}
solved[a[i]] = true; answer(i, a[i]);
}
}
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