Codeforces Beta Round #10 / 10A Power Consumption Calculation (模拟)

A. Power Consumption Calculation

http://codeforces.com/problemset/problem/10/A

time limit per test

memory limit per test

input

output

P₁ watt per minute. T₁ minutes after Tom moved the mouse or touched the keyboard for the last time, a screensaver starts and power consumption changes to P₂ watt per minute. Finally, after T₂ minutes from the start of the screensaver, laptop switches to the "sleep" mode and consumes P₃ watt per minute. If Tom moves the mouse or touches the keyboard when the laptop is in the second or in the third mode, it switches to the first (normal) mode. Tom's work with the laptop can be divided into n time periods [l₁, r₁], [l₂, r₂], ..., [l_n, r_n]. During each interval Tom continuously moves the mouse and presses buttons on the keyboard. Between the periods Tom stays away from the laptop. Find out the total amount of power consumed by the laptop during the period [l₁, r_n].

Input

n, P₁, P₂, P₃, T₁, T₂ (1 ≤ n ≤ 100, 0 ≤ P₁, P₂, P₃ ≤ 100, 1 ≤ T₁, T₂ ≤ 60). The following nlines contain description of Tom's work. Each i-th of these lines contains two space-separated integers l_i and r_i (0 ≤ l_i < r_i ≤ 1440, r_i < l_i + 1 for i < n), which stand for the start and the end of the i-th period of work.

Output

Output the answer to the problem.

Sample test(s)

input

1 3 2 1 5 10 0 10

output

30

input

2 8 4 2 5 10 20 30 50 100

output

570

注意t2是接在t1后面算的。

完整代码：

/*30ms,0KB*/

#include<cstdio>

int main()
{
	int n, p1, p2, p3, t1, t2;
	scanf("%d%d%d%d%d%d", &n, &p1, &p2, &p3, &t1, &t2);
	int p1pow = t1 * p1, p2pow = t2 * p2;
    int l, r, l2, r2;
	scanf("%d%d", &l, &r);
	int sum = (r - l) * p1;
	while (--n)
	{
		scanf("%d%d", &l2, &r2);
		int mid = l2 - r ;
		if (mid <= t1)
			sum += mid * p1;
		else
		{
			sum += p1pow;
			mid -= t1;
			if (mid <= t2)
				sum += mid * p2;
			else
				sum += p2pow + (mid - t2) * p3;
		}
		sum += (r2 - l2) * p1;
		l = l2;
		r = r2;
	}
	printf("%d", sum);
	return 0;
}