제출 #566159

#제출 시각아이디문제언어결과실행 시간메모리
566159UzoufXylophone (JOI18_xylophone)C++14
100 / 100
102 ms1112 KiB
#include <bits/stdc++.h>
#include "xylophone.h"
using namespace std;

map<pair<int,int>,int> df;
int sign[5005];
int og[5005],ans[5005];
 
void solve(int N) {
    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=2;i<=N-1;i++) {
      if (df[{i-1,i+1}]==df[{i-1,i}]+df[{i,i+1}]) sign[i]=sign[i-1];
      else sign[i]=sign[i-1]^1;
    }
 
    int mn=0;
    og[1]=0;
    for (int i=1;i<=N-1;i++) {
      if (sign[i]==0) {
        og[i+1]=og[i]+df[{i,i+1}];
      }
      else {
        og[i+1]=og[i]-df[{i,i+1}];
      }
      mn=min(mn,og[i+1]);
    }
 
    mn=1-mn;
    bool f1=false,gg=false;
    for (int i=1;i<=N;i++) {
      //cout<<og[i]<<' ';
      ans[i]=og[i]+mn;
      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]);
    }
  
}
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