Submission #229869

#	Time	Username	Problem	Language	Result	Execution time	Memory
229869		pedroslrey	Money (IZhO17_money)	C++14	0 / 100	5 ms	256 KiB

money

#pragma GCC target ("avx2")
#pragma GCC optimization ("O3")
#pragma GCC optimization ("unroll-loops")

#include <bits/stdc++.h>

using namespace std;

using pii = pair<int, int>;
using lli = long long int;

#define debug(args...) fprintf(stderr, args)
#define pb push_back
#define fi first
#define se second
#define all(xs) xs.begin(), xs.end()

const int INF = 1e9;

vector<int> xs;
vector<int> ys;
 
int main() {
	int n;
	scanf("%d", &n);
	for (int i = 0; i < n; ++i) {
		int x;
		scanf("%d", &x);
		xs.pb(x);
	}
 
	ys.push_back(xs[0]);
	for (int i = 1; i < n; ++i)
		if (xs[i] != xs[i-1])
			ys.push_back(xs[i]);

	int m = (int)ys.size();

	set<int> s; 
	s.insert(INF);
	int total = 0;
	int k = 0;
 
	for (int i = 0; i < m-1; ++i) {
		if ((ys[i] > ys[i+1]) || (ys[i] < ys[i+1] && *s.lower_bound(ys[i]-k+1) < ys[i+1])){
			k = 0;
			++total;
		}
		else k = 1;
		s.insert(ys[i]);
	}
 
	printf("%d\n", total);
}

Compilation message (stderr)

money.cpp:2:0: warning: ignoring #pragma GCC optimization [-Wunknown-pragmas]
 #pragma GCC optimization ("O3")
 
money.cpp:3:0: warning: ignoring #pragma GCC optimization [-Wunknown-pragmas]
 #pragma GCC optimization ("unroll-loops")
 
money.cpp: In function 'int main()':
money.cpp:25:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &n);
  ~~~~~^~~~~~~~~~
money.cpp:28:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &x);
   ~~~~~^~~~~~~~~~

• Subtask 1: 0 / 9
• Subtask 2: 0 / 16
• Subtask 3: 0 / 20
• Subtask 4: 0 / 55