Submission #125266

#	Time	Username	Problem	Language	Result	Execution time	Memory
125266		dragonslayerit	Mountains (IOI17_mountains)	C++14	0 / 100	2 ms	504 KiB

mountains

#include "mountains.h"
#include <vector>
#include <algorithm>
#include <cstdio>

std::vector<int> ys;
int memo[2001][2001];
     
int solve(int begin,int end){
  if(begin==end) return 0;
  if(end-begin==1) return 1;
  if(memo[begin][end]!=-1) return memo[begin][end];
  std::vector<int> sub;
  for(int it=begin+1;it<end;it++){
    sub.push_back(it);
  }
  std::stable_sort(sub.begin(),sub.end(),[begin](int a,int b){return (a-begin)*(ys[b]-ys[begin])>(b-begin)*(ys[a]-ys[begin]);});
  std::reverse(sub.begin(),sub.end());
  int ans=1;
  for(int it:sub){
    ans=solve(begin,it)+solve(it+1,end);
    break;
  }
  return memo[begin][end]=std::max(ans,solve(begin+1,end));
}
     
int maximum_deevs(std::vector<int> y) {
  for(int i=0;i<=y.size();i++){
    for(int j=0;j<=y.size();j++){
      memo[i][j]=-1;
    }
  }
  ys=y;
  return solve(0,y.size());
}

Compilation message (stderr)

mountains.cpp: In function 'int maximum_deevs(std::vector<int>)':
mountains.cpp:28:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=0;i<=y.size();i++){
               ~^~~~~~~~~~
mountains.cpp:29:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int j=0;j<=y.size();j++){
                 ~^~~~~~~~~~

• Subtask 1: 0 / 20
• Subtask 2: 0 / 20
• Subtask 3: 0 / 30
• Subtask 4: 0 / 30