Submission #125273

#	Time	Username	Problem	Language	Result	Execution time	Memory
125273		dragonslayerit	Mountains (IOI17_mountains)	C++14	100 / 100	66 ms	43768 KiB

mountains

//Is there a case that breaks my previous submission?
#include "mountains.h"
#include <vector>
#include <algorithm>
#include <cstdio>
     
int memo[2001][2001];

int best[2001][2001];
int first[2001][2001];//if i is required
     
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;
    }
  }
  for(int i=0;i<y.size();i++){
    first[i][i+1]=1;
    best[i][i+1]=1;
  }
  for(int i=y.size()-1;i>=0;i--){
    int k=i+1;
    for(int j=i+2;j<=y.size();j++){
      first[i][j]=first[i][k]+best[k+1][j];
      best[i][j]=std::max(first[i][j],best[i+1][j]);
      if(1LL*(k-i)*(y[j]-y[i])>=1LL*(j-i)*(y[k]-y[i])){
	k=j;
      }
    }
  }
  return best[0][y.size()];
}

Compilation message (stderr)

mountains.cpp: In function 'int maximum_deevs(std::vector<int>)':
mountains.cpp:13:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=0;i<=y.size();i++){
               ~^~~~~~~~~~
mountains.cpp:14:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int j=0;j<=y.size();j++){
                 ~^~~~~~~~~~
mountains.cpp:18:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=0;i<y.size();i++){
               ~^~~~~~~~~
mountains.cpp:24:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int j=i+2;j<=y.size();j++){
                   ~^~~~~~~~~~

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