Submission #259883

#	Time	Username	Problem	Language	Result	Execution time	Memory
259883		peuch	Global Warming (CEOI18_glo)	C++17	100 / 100	83 ms	4676 KiB

glo

#include<bits/stdc++.h>
using namespace std;

const int MAXN = 2e5 + 10;
const int INF = 2e9 + 7;

int n, x;
int v[MAXN];
int dp[MAXN];
int maxi[MAXN];
int ans;

int main(){
	scanf("%d %d", &n, &x);
	for(int i = 1; i <= n; i++)
	scanf("%d", &v[i]);
	for(int j = 1; j <= n; j++)
		dp[j] = INF;
	for(int i = 1; i <= n; i++){
		int k = lower_bound(dp, dp + 1 + n, v[i]) - dp;
		dp[k] = v[i];
		maxi[i] = k;
		ans = max(ans, k);
	}
	for(int j = 1; j <= n; j++)
		dp[j] = INF;
	dp[0] = -INF;
	for(int i = n; i > 0; i--){
		int aux = lower_bound(dp, dp + 1 + n, -v[i]) - dp;
		aux--;
		int k = lower_bound(dp, dp + 1 + n, -v[i] - x) - dp;
		dp[k] = -v[i] - x;
		ans = max(ans, maxi[i] + aux);
		ans = max(ans, k);
	}
	printf("%d\n", ans);
}

Compilation message (stderr)

glo.cpp: In function 'int main()':
glo.cpp:14:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d", &n, &x);
  ~~~~~^~~~~~~~~~~~~~~~~
glo.cpp:16:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &v[i]);
  ~~~~~^~~~~~~~~~~~~

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