Лимит времени 2000/4000/4000/4000 мс. Лимит памяти 65000/65000/65000/65000 Кб.
bfs.
Area
A large agricultural corporation is undertaking an
audit of its N land properties. As a first step,
they would like to know the total area of their
properties.
Each property has a rectangular shape, and no
two properties overlap.
Question:
Write a program that, given the dimensions
of N land properties, determines
the sum of their areas.
Input specification:
Your program should read from the
standard input the following data:
- The first line contains a single integer:
the number of properties N.
- The next N lines describe the properties,
one property per line. The kth of these lines
describes property number k and it contains
two integers separated by a single space: the
lengths of the sides of the property Ak and
Bk measured in meters
Constraints:
1 ≤ N ≤ 50000 { The number of land properties
1 ≤ (Ak , Bk) ≤10000 { The lengths of the sides of property k
Output specification:
Your program should write to the standard
output a single line containing a single
integer: the total area of all properties,
measured in square meters.
Note:
The final answer may not fit in 32 bits. You
have to use a 64-bit data type, such as
long long in C/C++, in order to compute
and store the answer in a single variable.
| Sample Input I |
Sample Input II |
3
15 25
5 6
3 1
|
4
400 400
200 200
100 100
50 50
|
| Sample Output I |
Sample Output II |
408
|
212500
|
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|