Submission #348130

#	Time	Username	Problem	Language	Result	Execution time	Memory
348130		mariowong	Xylophone (JOI18_xylophone)	C++14	Compilation error	0 ms	0 KiB

xylophone

#include "xylophone.h"

static int A[5000];
int dif1[5005],dif2[5005],b[5005];
pair <int,int> a[5005];
bool vis[5005];
void solve(int N) {
	for (int i=2;i<=N;i++){
		dif1[i]=query(i-1,i); 
	}
	for (int i=3;i<=N;i++){
		dif2[i]=query(i-2,i); 
	}
	a[2].first=0;
	a[2].second=1;
	for (int i=3;i<=N;i++){
		if (dif1[i]+dif1[i-1] == dif2[i])
		a[i]=a[i-1];
		else
		{
			a[i].first=a[i-1].second;
			a[i].second=a[i-1].first;
		}
	}
	for (int i=1;i<=N;i++){
		b[1]=i;
		for (int j=1;j<=N;j++){
			vis[j]=false;
		}
		for (int j=2;j<=N;j++){
			if (a[j].first == 1)
			b[j]=b[j-1]+dif1[j];
			else
			b[j]=b[j-1]-dif1[j];
		}
		for (int j=1;j<=N;j++){
			if (b[j] < 1 || b[j] > N)
			break;
			if (vis[b[j]])
			break;
			vis[b[j]]=true;
			if (j == N)
			goto out;
		}
		
		for (int j=1;j<=N;j++){
			vis[j]=false;
		}
		b[1]=i;
		for (int j=2;j<=N;j++){
			if (a[j].second == 1)
			b[j]=b[j-1]+dif1[j];
			else
			b[j]=b[j-1]-dif1[j];
		}
		for (int j=1;j<=N;j++){
			if (b[j] < 1 || b[j] > N)
			break;
			if (vis[b[j]])
			break;
			vis[b[j]]=true;
			if (j == N)
			goto out;
		}
	}
	out:;
	for(int i = 1; i <= N; i++) {
		answer(i, b[i]);
	}

}

Compilation message (stderr)

xylophone.cpp:5:1: error: 'pair' does not name a type
    5 | pair <int,int> a[5005];
      | ^~~~
xylophone.cpp: In function 'void solve(int)':
xylophone.cpp:14:2: error: 'a' was not declared in this scope
   14 |  a[2].first=0;
      |  ^
xylophone.cpp: At global scope:
xylophone.cpp:3:12: warning: 'A' defined but not used [-Wunused-variable]
    3 | static int A[5000];
      |            ^