Submission #681903

#	Time	Username	Problem	Language	Result	Execution time	Memory
681903		MarwenElarbi	Global Warming (CEOI18_glo)	C++14	0 / 100	31 ms	4920 KiB

glo

#include <bits/stdc++.h>
#define vi vector<int>
#define ve vector
#define ll long long
#define vl vector<ll>
#define vll vector<pair<ll,ll>>
#define ii pair<int,int>
#define vvi vector<vi>
#define vii vector<ii>
#define gii greater<ii>
#define pb push_back
#define mp make_pair
#define fi first
#define se second
#define INF 1e9
#define eps 1e-7
#define eps1 1e-2
#define optimise ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
#define MAX_A 1e5+5
using namespace std;
const int MOD = 1e9+7;
const int nax = 2*1e3+5;
double PI=3.14159265359;
int arx[8]={1,1,0,-1,-1,-1, 0, 1};
int ary[8]={0,1,1, 1, 0,-1,-1,-1};
typedef complex<int> Point;
#define X real()
#define Y imag()
void setIO(string s) {
    freopen((s + ".in").c_str(), "r", stdin);
    freopen((s + ".out").c_str(), "w", stdout);
}
int main(){
    optimise;
    /*#ifndef ONLINE_JUDGE
        freopen("input.txt", "r", stdin);
        freopen("output.txt", "w", stdout);
    #endif*/
    //setIO("nocross");
    int n,k;
    cin>>n>>k;
    vi tab(n);
    for (int i = 0; i < n; ++i)
    {
        cin>>tab[i];
    }
    vi pre(n,0);
    vi dp;
    for(int i=0;i<n;i++)
    {
        int j=upper_bound(dp.begin(),dp.end(),tab[i])-dp.begin();
        if (j==dp.size()) dp.pb(i);
        else if (dp[j-1]<tab[i]&&tab[i]<dp[j]) dp[j]=tab[i];
        pre[i]=j;
    }
    int longest=0;
    dp.assign(n,1e9+5);
    for (int i = n-1; i >= 0; --i)
    {
        int j=lower_bound(dp.begin(),dp.end(),-tab[i]+k)-dp.begin();
        longest=max(longest,pre[i]+j);
        j=lower_bound(dp.begin(),dp.end(),-tab[i])-dp.begin();
        dp[j]=tab[i];
    }cout <<longest<<endl;
}   

Compilation message (stderr)

glo.cpp: In function 'int main()':
glo.cpp:52:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   52 |         if (j==dp.size()) dp.pb(i);
      |             ~^~~~~~~~~~~
glo.cpp: In function 'void setIO(std::string)':
glo.cpp:30:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   30 |     freopen((s + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
glo.cpp:31:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   31 |     freopen((s + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 5
• Subtask 2: 0 / 10
• Subtask 3: 0 / 13
• Subtask 4: 0 / 10
• Subtask 5: 0 / 20
• Subtask 6: 0 / 17
• Subtask 7: 0 / 25