Submission #395549

#	Time	Username	Problem	Language	Result	Execution time	Memory
395549		Qw3rTy	Global Warming (CEOI18_glo)	C++11	15 / 100	2071 ms	1228 KiB

glo

#include <bits/stdc++.h>
#define INF 1e9+5
using namespace std;

const int maxN = 1e5+5;

int a[maxN];
int b[maxN];
int f[maxN]; //f[i] = longest decreasing subsequence of b that ends on N+1-i
int g[maxN]; //g[i] = longest increasing subsequence of a that ends on i
int N,d;

void testIO(){
    freopen("../test.in","r",stdin);
    return;
}

signed main(){
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    //testIO();
    cin >> N >> d;
    for(int i = 1; i <= N; ++i)cin >> a[i];
    for(int i = 1; i <= N; ++i)b[i] = a[N+1-i];
    b[0] = INF;
    for(int i = 1; i <= N; ++i){
        for(int j = 0; j < i; ++j){
            if(b[i] < b[j])f[i] = max(f[i],f[j]+1);
        }
    }
    a[0] = -INF;
    for(int i = 1; i <= N; ++i){
        for(int j = 0; j < i; ++j){
            if(a[i] > a[j])g[i] = max(g[i],g[j]+1);
        }
    }
    int res = 0;
    for(int i = 1; i <= N; ++i){
        if(a[i-1] - d < a[i])res = max(res, g[i-1] + f[N+1-i]);
    }
    cout << res << '\n';
    return 0;
}

Compilation message (stderr)

glo.cpp: In function 'void testIO()':
glo.cpp:14:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   14 |     freopen("../test.in","r",stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

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