Submission #135253

#	Time	Username	Problem	Language	Result	Execution time	Memory
135253		FedericoS	Money (IZhO17_money)	C++14	100 / 100	1394 ms	62044 KiB

money

#include <iostream>
#include <set>
#include <vector>
using namespace std;

int N;
int B[1000006];
vector<int> A;
set<int> S;
int ans;
bool flag;

int readInt()
{
    int res = 0;
    char ch = 0;
    while(ch < '0') ch = getchar_unlocked();
    for(; ch >= '0'; ch = getchar_unlocked()) res = res * 10 + ch - '0';
    return res;
}

void writeInt(int v)
{
    char buf[14];
    int p = 0;
    if(v == 0) buf[p++] = 0;
    for(; v; v /= 10) buf[p++] = v % 10;
    while(p--) putchar_unlocked(buf[p] + '0');
}

int main(){
	N=readInt();
	for(int i=0;i<N;i++)
		B[i]=readInt();

	A.push_back(B[0]);
	for(int i=1;i<N;i++)
		if(B[i]!=B[i-1])
			A.push_back(B[i]);
	N=A.size();

	S.insert(1e9);

	for(int i=0;i<N-1;i++){
		if((A[i]>A[i+1]) or (A[i]<A[i+1] and *S.lower_bound(A[i]-flag+1)<A[i+1])){
			flag=false;
			ans++;
		}
		else
			flag=true;
		S.insert(A[i]);
	}

	writeInt(ans+1);

}

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