Submission #519765

#	Time	Username	Problem	Language	Result	Execution time	Memory
519765		idas	Global Warming (CEOI18_glo)	C++11	17 / 100	61 ms	4716 KiB

glo

#include <bits/stdc++.h>
#define FOR(i, begin, end) for(int i = (begin); i < (end); i++)
#define FAST_IO ios_base::sync_with_stdio(0); cin.tie(nullptr); cout.tie(nullptr)
#define f first
#define s second
#define pb push_back
#define sz(x) ((int)((x).size()))
#define le(vec) vec[vec.size()-1]
#define all(x) (x).begin(), (x).end()
#define TSTS int ttt; cin >> ttt; while(ttt--) solve()

using namespace std;
typedef pair<int, int> pii;
typedef pair<long long, long long> pll;
typedef pair<long double, long double> pdd;
typedef map<int, int> mii;
typedef vector<int> vi;
typedef long double ld;
typedef long long ll;

const int INF=1e9, MOD=1e9+7, mod=998244353;
const ll LINF=1e18;

void setIO()
{
    FAST_IO;
}

void setIO(string s)
{
    FAST_IO;
    freopen((s+".in").c_str(), "r", stdin);
    freopen((s+".out").c_str(), "w", stdout);
}

const int N=2e5+10;
int n, x, t[N], d[N];

int main()
{
    setIO();
    cin >> n >> x;
    FOR(i, 0, n) cin >> t[i];

    vi lds;
    for(int i=n-1; i>=0; i--){
        int l=0, r=sz(lds);
        while(l<r){
            int m=(l+r)/2;
            if(lds[m]>t[i]) l=m+1;
            else r=m;
        }
        if(l==sz(lds)) lds.pb(t[i]);
        else lds[l]=t[i];

        d[i]=sz(lds);
    }

    vi lis; int mx=0;
    FOR(i, 0, n)
    {
        t[i]-=x;
        int in=lower_bound(all(lis), t[i])-lis.begin();
        if(in==sz(lis)) lis.pb(t[i]);
        else lis[in]=t[i];
        int now=sz(lis)-1;
        while(now!=-1 && lis[now]>=t[i+1]) now--;
        if(now!=-1) mx=max(mx, now+1+d[i+1]);
    }

    cout << mx;
}

Compilation message (stderr)

glo.cpp: In function 'void setIO(std::string)':
glo.cpp:32:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   32 |     freopen((s+".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
glo.cpp:33:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   33 |     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: 17 / 17
• Subtask 7: 0 / 25