Submission #764559

#	Time	Username	Problem	Language	Result	Execution time	Memory
764559		vjudge1	Xylophone (JOI18_xylophone)	C++17	Compilation error	0 ms	0 KiB

xylophone

#include "xylophone.h"
using namespace std;

const int MN=5e3+5;

int arr[MN];

void solve(int N){
	int n=N;
	int l=1,r=n-1;
	while(l<r){
		int mid=l+r>>1;
		int res=query(mid,n);
//		cout<<"Case "<<mid<<' '<<n<<": "<<res<<'\n';
		
		if(res==n-1) l=mid+1;
		else r=mid;
	}
	int idx=l-1;
	answer(idx,1);
	l=idx-2; r=idx+2;
	
	if(idx>1){
		int res=query(idx-1,idx);
		answer(idx-1,res+1);
	}
	int res=query(idx,idx+1);
	answer(idx+1,res+1);
	
	for(int i=l;i>=1;--i){
		int res=query(i,i+1);
			int res2=query(i,i+2); --limit;
			if(res==res2){
				if(arr[i+2]<arr[i+1]) arr[i]=arr[i+1]-res;
				else arr[i]=arr[i+1]+res;
			}
			else{
				if(arr[i+1]>arr[i+2]){
					if(res2==arr[i+1]-arr[i+2]) arr[i]=arr[i+1]-res;
					else arr[i]=arr[i+1]+res;
				}
				else{
					if(res2==arr[i+2]-arr[i+1]) arr[i]=arr[i+1]+res;
					else arr[i]=arr[i+1]-res;
				}
			}
			answer(i,arr[i]);
	}
	for(int i=r;i<=n;++i){
		int res2=query(i-2,i); --limit;
//			cout<<"Case "<<i<<": "<<res<<' '<<res2<<'\n';
			if(res==res2){
				if(arr[i-2]<arr[i-1]) arr[i]=arr[i-1]-res;
				else arr[i]=arr[i-1]+res;
			}
			else{
				if(arr[i-2]<arr[i-1]){
					if(res2==arr[i-1]-arr[i-2]) arr[i]=arr[i-1]-res;
					else arr[i]=arr[i-1]+res;
				}
				else{
					if(res2==arr[i-2]-arr[i-1]) arr[i]=arr[i-1]+res;
					else arr[i]=arr[i-1]-res;
				}
			}
			answer(i,arr[i]);
	}
}

Compilation message (stderr)

xylophone.cpp: In function 'void solve(int)':
xylophone.cpp:12:12: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   12 |   int mid=l+r>>1;
      |           ~^~
xylophone.cpp:32:29: error: 'limit' was not declared in this scope
   32 |    int res2=query(i,i+2); --limit;
      |                             ^~~~~
xylophone.cpp:50:28: error: 'limit' was not declared in this scope
   50 |   int res2=query(i-2,i); --limit;
      |                            ^~~~~