Submission #98849

#	Time	Username	Problem	Language	Result	Execution time	Memory
98849		janchomath	Xylophone (JOI18_xylophone)	C++14	Compilation error	0 ms	0 KiB

xylophone

//#include "grader.cpp"
#include<bits/stdc++.h>
#define ll long long
using namespace std;
bool fix[200005];
ll ans[200005],ind;
void solve(int n) {
	ll l = 2,r = n,mid = 0;
	
	while(l <= r){
		mid = (l + r) / 2;
		ll curans = query(1,mid);
	//	cout << 1 << " " << mid << " " << curans << endl;
		if(curans != n - 1){
			l = mid + 1;
		}
		else {
			ind = mid;
			r = mid - 1;
		}
	}
	
	ans[ind] = n;
	fix[n] = 1;
	if(ind != n){
		ans[ind + 1] = n - query(ind,ind + 1);
	}
	
	for(int i=ind+1; i<=n; i++){
		fix[ans[i]] = 1;
		if(i == n){
			break;
		}
		ll k1 = query(i,i + 1);
		if(ans[i] + k1 >= n || fix[ans[i] + k1]){
			ans[i + 1] = ans[i] - k1;
			continue;
		}
		if(ans[i] - k1 <= 0 || fix[ans[i] - k1]){
			ans[i + 1] = ans[i] + k1;
			continue;
		}
		ll k2 = query(i - 1,i + 1);
		
		if(ans[i - 1] < ans[i]){
			if(k2 == k1 + ans[i] - ans[i - 1]){
				ans[i + 1] = ans[i] + k1;
			}
			else {
				ans[i + 1] = ans[i] - k1;
			}
		}
		else {
			if(k2 == k1 + ans[i - 1] - ans[i]){
				ans[i + 1] = ans[i] - k1;
			}
			else {
				ans[i + 1] = ans[i] + k1;
			}
		}
	}
	
	if(ind > 1){
		ans[ind - 1] = n - query(ind-1,ind);
	}
	for(int i=ind - 1; i>=1; i--){
		fix[ans[i]] = 1;
	//	cout << i << " " << ans[i] << endl;
		if(i == 1){
			break;
		}
		ll k1 = query(i - 1,i);
		if(ans[i] + k1 >= n || fix[ans[i] + k1]){
			ans[i - 1] = ans[i] - k1;
			continue;
		}
		if(ans[i] - k1 <= 0 || (fix[ans[i] - k1] && ans[i] - k1 >= 0)){
			ans[i - 1] = ans[i] + k1;
			continue;
		}
	//	cout << "ET\n";
		ll k2 = query(i - 1,i + 1);
		
		if(ans[i + 1] < ans[i]){
			if(k2 == k1 + ans[i] - ans[i + 1]){
				ans[i - 1] = ans[i] + k1;
			}
			else {
				ans[i - 1] = ans[i] - k1;
			}
		}
		else {
			if(k2 == k1 + ans[i + 1] - ans[i]){
				ans[i - 1] = ans[i] - k1;
			}
			else {
				ans[i - 1] = ans[i] + k1;
			}
		}
	}
	
	for(int i=1; i<=n; i++){
	//	cout << ans[i] << endl;
		answer(i,ans[i]);
	}
	
}

Compilation message (stderr)

xylophone.cpp: In function 'void solve(int)':
xylophone.cpp:12:15: error: 'query' was not declared in this scope
   ll curans = query(1,mid);
               ^~~~~
xylophone.cpp:26:22: error: 'query' was not declared in this scope
   ans[ind + 1] = n - query(ind,ind + 1);
                      ^~~~~
xylophone.cpp:34:11: error: 'query' was not declared in this scope
   ll k1 = query(i,i + 1);
           ^~~~~
xylophone.cpp:64:22: error: 'query' was not declared in this scope
   ans[ind - 1] = n - query(ind-1,ind);
                      ^~~~~
xylophone.cpp:72:11: error: 'query' was not declared in this scope
   ll k1 = query(i - 1,i);
           ^~~~~
xylophone.cpp:104:3: error: 'answer' was not declared in this scope
   answer(i,ans[i]);
   ^~~~~~
xylophone.cpp:104:3: note: suggested alternative: 'ans'
   answer(i,ans[i]);
   ^~~~~~
   ans