| # | 제출 시각 | 아이디 | 문제 | 언어 | 결과 | 실행 시간 | 메모리 |
|---|---|---|---|---|---|---|---|
| 1324289 | adscoding | Xylophone (JOI18_xylophone) | C++20 | 0 ms | 0 KiB |
#include "xylophone.h"
#include <bits/stdc++.h>
#define fi first
#define se second
#define FOR(i, a, b) for (int i = a, _b = b; i <= _b; ++i)
#define FORD(i, a, b) for (int i = a, _b = b; i >= _b; --i)
#define FORLL(i, a, b) for (ll i = a, _b = b; i <= _b; ++i)
#define FORDLL(i, a, b) for (ll i = a, _b = b; i >= _b; --i)
#define all(x) x.begin(), x.end()
#define uni(x) sort(all(x)), x.erase(unique(all(x)), x.end())
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
#define dbg(...) debug(#__VA_ARGS__, __VA_ARGS__)
template<typename T>
void __prine_one(const char *&s, const T &x)
{
while (*s == ' ') ++s;
const char *p = s;
int bal = 0;
while (*s)
{
if (*s == '(') ++bal;
else if (*s == ')') --bal;
else if (*s == ',' && bal == 0) break;
++s;
}
cerr.write(p, s - p) << " = " << x;
if (*s == ',')
{
cerr << " , ";
++s;
}
}
template<typename... Args>
void debug(const char *s, Args... args)
{
cerr << "[ ";
int dummy[] = {0, (__prine_one(s, args), 0)...};
(void)dummy;
cerr << " ]\n\n";
}
template<class X>
bool maximize(X &a, const X &b)
{
if (a < b)
{
a = b;
return true;
}
return false;
}
template<class X>
bool minimize(X &a, const X &b)
{
if (a > b)
{
a = b;
return true;
}
return false;
}
// --------------------------------------------------------------------------------------------
const int maxn = 1e5 + 3;
int n, a[maxn], RES[maxn];
bool mark[maxn];
// --------------------------------------------------------------------------------------------
int query(int l, int r)
{
cout << "? " << l << ' ' << r << endl;
int x; cin >> x;
return x;
}
void answer(int i, int x)
{
cout << i << ' ' << x << endl;
}
bool valid(int x)
{
return x >= 1 && x <= n && !mark[x];
}
int get_ans(int root, int so, int delta)
{
if (root < so)
return root + delta;
return root - delta;
}
void solve(int n)
{
int l = 1, r = n;
while (l <= r)
{
int mid = l + r >> 1;
if (query(mid, n) == n - 1)
l = mid + 1;
else
r = mid - 1;
}
int pos1 = r;
a[pos1] = 1;
mark[1] = true;
pii cur = {0, 0};
if (pos1 < n)
{
RES[pos1] = query(pos1, pos1 + 1);
a[pos1 + 1] = RES[pos1] + 1;
FOR(i, pos1 + 2, n)
{
mark[a[i - 1]] = true;
RES[i - 1] = query(i - 1, i);
if (!valid(a[i - 1] + RES[i - 1]))
{
a[i] = a[i - 1] - RES[i - 1];
continue;
}
else if (!valid(a[i - 1] - RES[i - 1]))
{
a[i] = a[i - 1] + RES[i - 1];
continue;
}
int cur = query(i - 2, i);
if (cur == RES[i - 1])
a[i] = get_ans(a[i - 1], a[i - 2], cur);
else if (cur == RES[i - 2])
a[i] = get_ans(a[i - 1], a[i - 2], RES[i - 1]);
else
a[i] = get_ans(a[i - 2], a[i - 1], cur);
}
}
if (pos1 > 1)
{
RES[pos1 - 1] = query(pos1 - 1, pos1);
a[pos1 - 1] = RES[pos1 - 1] + 1;
FORD(i, pos1 - 2, 1)
{
mark[a[i + 1]] = true;
RES[i] = query(i, i + 1);
if (!valid(a[i + 1] + RES[i]))
{
a[i] = a[i + 1] - RES[i];
continue;
}
else if (!valid(a[i + 1] - RES[i]))
{
a[i] = a[i + 1] + RES[i];
continue;
}
int cur = query(i, i + 2);
if (cur == RES[i])
a[i] = get_ans(a[i + 1], a[i + 2], cur);
else if (cur == RES[i + 1])
a[i] = get_ans(a[i + 1], a[i + 2], RES[i]);
else
a[i] = get_ans(a[i + 2], a[i + 1], cur);
}
}
FOR(i, 1, n)
answer(i, a[i]);
}
signed main()
{
ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
// #define TASK "TEST"
// if (fopen(TASK".INP", "r"))
// {
// freopen(TASK".INP", "r", stdin);
// freopen(TASK".OUT", "w", stdout);
// }
cin >> n;
solve(n);
return 0;
}