Submission #239584

#	Time	Username	Problem	Language	Result	Execution time	Memory
239584		ctziapo	Xylophone (JOI18_xylophone)	C++14	47 / 100	109 ms	384 KiB

xylophone

#include "xylophone.h"
#include<cmath>
#include<map>
static int A[5000];

using namespace std;

void solve(int N) {
    int n=N;
	int value = query(1, N);
    int pf;
  // cout<<" find first "<<endl;
	//for(int i=1;i<=n;i++){
   //     int t=query(i,N);
   //     if(t!=n-1){
    //       pf=i-1;
   //        break;
     //   }
	//}
	int l=1;
	int r=n;
	while(l<r){
        int mid = (l+r)/2;
        int t=query(mid,n);

        if(t==n-1){
            l=mid+1;
        }
        else
            r=mid-1;

	}
	if(query(l,n)!=n-1)
        l--;
//	cout<<"ssssssss "<<l<<endl;
    pf=l;
	int f[10000]={};

	//cout<<pf<<endl;
    answer(pf,1);
    f[1]=1;
  //  cout<<"os edo"<<endl;
    int a[n+3]={};
    a[pf]=1;
    if(pf!=1){
        a[pf-1] = query(pf-1,pf)+1;
        answer(pf-1,a[pf-1]);
        f[a[pf-1]]=1;
    }
    if(pf!=N){
        a[pf+1] = query(pf,pf+1)+1;
        answer(pf+1,a[pf+1]);
        f[a[pf+1]]=1;
    }

   // cout<<"my answer "<<endl;
	//for(int i = 1; i <= N; i++) {
	//	cout<<a[i]<<" ";
	//}


    int s=pf+2;

    while(s<=n){

        int t=query(s-1,s);
        if(f[a[s-1]+t]==1){
            a[s]=a[s-1]-t;
            answer(s,a[s]);
            f[a[s]]=1;
            s++;
            continue;
        }
        if(f[a[s-1]-t]==1){
            a[s]=a[s-1]+t;
            answer(s,a[s]);
            f[a[s]]=1;
            s++;
            continue;
        }
        int t2=query(s-2,s);

        if(abs(a[s-1]-a[s-2])==t2){
            if(a[s-1] > a[s-2]){
                a[s]=a[s-1]-t;
                answer(s,a[s]);
            }
            else{
                a[s]=a[s-1]+t;
                answer(s,a[s]);
            }
        }
        else
        {
            if(a[s-1] > a[s-2]){
                if(a[s-1]-a[s-2] + t == t2){
                a[s]=a[s-1]+t;
                answer(s,a[s]);
                }
                else
                {
                a[s]=a[s-1]-t;
                answer(s,a[s]);
                }
            }
            else{
                if(a[s-2]-a[s-1] + t == t2){
                a[s]=a[s-1]-t;
                answer(s,a[s]);
                }
                else
                {
                a[s]=a[s-1]+t;
                answer(s,a[s]);
                }
            }
        }

    //    cout<<"my answer "<<endl;
	//for(int i = 1; i <= N; i++) {
	//	cout<<a[i]<<" ";
	//}


        s++;
    }




    s=pf-2;

    while(s>=1){

        int t=query(s,s+1);
        if(f[a[s+1]+t]==1){
            a[s]=a[s+1]-t;
            answer(s,a[s]);
            f[a[s]]=1;
            s--;
            continue;
        }
        if(f[a[s+1]-t]==1){
            a[s]=a[s+1]+t;
            answer(s,a[s]);
            f[a[s]]=1;
            s--;
            continue;
        }
        int t2=query(s,s+2);

        if(abs(a[s+1]-a[s+2])==t2){
            if(a[s+1] > a[s+2]){
                a[s]=a[s+1]-t;
                answer(s,a[s]);
            }
            else{
                a[s]=a[s+1]+t;
                answer(s,a[s]);
            }
        }
        else
        {
            if(a[s+1] > a[s+2]){
                if(a[s+1]-a[s+2] + t == t2){
                a[s]=a[s+1]+t;
                answer(s,a[s]);
                }
                else
                {
                a[s]=a[s+1]-t;
                answer(s,a[s]);
                }
            }
            else{
                if(a[s+2]-a[s+1] + t == t2){
                a[s]=a[s+1]-t;
                answer(s,a[s]);
                }
                else
                {
                a[s]=a[s+1]+t;
                answer(s,a[s]);
                }
            }
        }

    //    cout<<"my answer "<<endl;
//	for(int i = 1; i <= N; i++) {
//		cout<<a[i]<<" ";
//	}


        s--;
    }




  //  cout<<"my answer "<<endl;
	//for(int i = 1; i <= N; i++) {
//		cout<<a[i]<<" ";
	//}

}

Compilation message (stderr)

xylophone.cpp: In function 'void solve(int)':
xylophone.cpp:10:6: warning: unused variable 'value' [-Wunused-variable]
  int value = query(1, N);
      ^~~~~
xylophone.cpp: At global scope:
xylophone.cpp:4:12: warning: 'A' defined but not used [-Wunused-variable]
 static int A[5000];
            ^

• Subtask 1: 11 / 11
• Subtask 2: 36 / 36
• Subtask 3: 0 / 53