Submission #566147

#	Time	Username	Problem	Language	Result	Execution time	Memory
566147		Uzouf	Xylophone (JOI18_xylophone)	C++14	0 / 100	1 ms	208 KiB

xylophone

#include <bits/stdc++.h>
#include "xylophone.h"
using namespace std;
 
bool sign[5005];
 
void solve(int N) {
  map<pair<int,int>,int> df;
    for (int i=1;i<=N;i++) {
      if (i+1<=N) {
        df[{i,i+1}]=query(i,i+1);
      }
      if (i+2<=N)  {
        df[{i,i+2}]=query(i,i+2);
      }
    }
  
  for (int i=1;i<=N-2;i++) {
      if (df[{i,i+2}]==df[{i,i+1}]+df[{i+1,i+2}]) {
        sign[i]=sign[i+1]=sign[i-1]; continue;
      }
      sign[i]=1^sign[i-1];
    }

    int og[N+5];
    og[1]=0;
    int mn=0;
    for (int i=2;i<=N;i++) {
      if (sign[i-1]==0) {
        og[i]=og[i-1]+df[{i-1,i}];
      }
      else {
        og[i]=og[i-1]-df[{i-1,i}];
      }
      mn=min(mn,og[i]);
    }

    mn*=-1;
    int ans[N+5];
    bool f1=false,gg=false;
    for (int i=1;i<=N;i++) {
      ans[i]=og[i]+mn+1;
      if (ans[i]==1) f1=true;
      if (ans[i]==N && !f1) gg=true;
    }

    for (int i=1;i<=N;i++) {
      if (gg) ans[i]=N+1-ans[i];
      answer(i,ans[i]);
    }
  
}

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