Submission #239580

#	Time	Username	Problem	Language	Result	Execution time	Memory
239580		ctziapo	Xylophone (JOI18_xylophone)	C++14	47 / 100	92 ms	384 KiB

xylophone

#include "xylophone.h"
#include<cmath>
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;
        }
	}
	//cout<<pf<<endl;
    answer(pf,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]);
    }
    if(pf!=N){
        a[pf+1] = query(pf,pf+1)+1;
        answer(pf+1,a[pf+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);
        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);
        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:9:6: warning: unused variable 'value' [-Wunused-variable]
  int value = query(1, N);
      ^~~~~
xylophone.cpp: At global scope:
xylophone.cpp:3:12: warning: 'A' defined but not used [-Wunused-variable]
 static int A[5000];
            ^
xylophone.cpp: In function 'void solve(int)':
xylophone.cpp:28:5: warning: 'pf' may be used uninitialized in this function [-Wmaybe-uninitialized]
     if(pf!=N){
     ^~

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