Submission #35197

#	Time	Username	Problem	Language	Result	Execution time	Memory
35197		ulna	Money (IZhO17_money)	C++11	100 / 100	189 ms	9828 KiB

money

#include <bits/stdc++.h>
using namespace std;
 
// why am I so weak
 
int n;
int a[1000055];
int dat[1000055];
 
inline void read(int &x) {
	x = 0;
	char ch = 0;
 
	while (ch < '0' || ch > '9') ch = getchar();
 
	while (ch >= '0' && ch <= '9') {
		x = x * 10 + (ch - '0');
		ch = getchar();
	}
}
void add(int id) {
	int val = id;

	while (id < (int)1e6) {
		dat[id] = max(dat[id], val);
		id |= (id + 1);
	}
}
int get(int id) {
	int res = -1;

	while (id >= 0) {
		res = max(res, dat[id]);
		id = (id & (id + 1)) - 1;
	}

	return res;
}
int main() {
	scanf("%d", &n);
 
	for (int i = 0; i < n; i++) {
		read(a[i]);
		a[i] = (int)1e6 - a[i];
	}
 
	int lb = 0, ub = (int)1e7;
	int res = 1;
 
	for (int i = 0; i < n; i++) {
		if (lb <= a[i] && a[i] <= ub) {
			add(a[i]);
			ub = a[i];
			continue;
		}
 
		ub = a[i];
		lb = get(a[i] - 1);
 
		res++;
		add(a[i]);
	}
 
	printf("%d\n", res);
 
	return 0;
}

Compilation message (stderr)

money.cpp: In function 'int main()':
money.cpp:40:17: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &n);
                 ^

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