CSES - DatatÃ¤hti 2016 alku - Results
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groupverdictscore
#1ACCEPTED14
#20
#30
Test results
testverdicttimegroup
#1ACCEPTED0.09 s1details
#2ACCEPTED0.08 s1details
#3ACCEPTED0.08 s1details
#4ACCEPTED0.08 s1details
#5ACCEPTED0.08 s1details
#6--2details
#7--2details
#8--2details
#9--2details
#10--2details
#11--3details
#12--3details
#13--3details
#14--3details
#15--3details

### Code

```import math

# Parse input
line = input().split()
height = int(line[0])
width = int(line[1])
desired_trees = int(line[2])

field = []
for y in range(height):
line = input()
field.append([x == '*' for x in line])

# Create index
index = []
for y in range(height):
index_line = []
for x in range(width):
this = 0
if field[y][x]:
this = 1
if y > 0:
this += index[y-1][x]
if x > 0:
this += index_line[x-1]
if y > 0 and x > 0:
this -= index[y-1][x-1]
index_line.append(this)
index.append(index_line)

# Calculate
def trees_in(x1, y1, size):
x2 = x1 + size - 1
y2 = y1 + size - 1
if x1 == 0 and y1 == 0:
return index[y2][x2]
elif x1 == 0:
return index[y2][x2] - index[y1-1][x2]
elif y1 == 0:
return index[y2][x2] - index[y2][x1-1]
else:
return index[y2][x2] - index[y1-1][x2] - index[y2][x1-1] + index[y1-1][x1-1]

options = 0
min_size = math.ceil(math.sqrt(desired_trees))
for y in range(height):
for x in range(width):
max_size = min(height-y, width-x)
for size in range(min_size, max_size+1):
trees = trees_in(x, y, size)
if trees == desired_trees:
options += 1
elif trees > desired_trees:
# bigger area can't have less trees
break

print(options)
```

### Test details

#### Test 1

Group: 1

Verdict: ACCEPTED

input
10 10 1
......*...
.......*..
*..*....*.
*....*....
...

correct output
94

user output
94

#### Test 2

Group: 1

Verdict: ACCEPTED

input
10 10 5
**********
**********
**********
**********
...

correct output
0

user output
0

#### Test 3

Group: 1

Verdict: ACCEPTED

input
10 10 10
**...*...*
*..*.**.*.
...**.*..*
*...**.*..
...

correct output
4

user output
4

#### Test 4

Group: 1

Verdict: ACCEPTED

input
10 10 5
****......
*.*.**..**
....*.*..*
...*.***..
...

correct output
16

user output
16

#### Test 5

Group: 1

Verdict: ACCEPTED

input
10 10 2
**.***..*.
...*.*....
.***.*...*
***.***..*
...

correct output
30

user output
30

#### Test 6

Group: 2

Verdict:

input
500 500 1
.................................

correct output
9552040

user output
(empty)

#### Test 7

Group: 2

Verdict:

input
500 500 5
.................................

correct output
1536063

user output
(empty)

#### Test 8

Group: 2

Verdict:

input
500 500 25000
**...*...**..*.*..*.**.*..*.*....

correct output
288

user output
(empty)

#### Test 9

Group: 2

Verdict:

input
500 500 12500
**.**.*..*...*.**...*.***........

correct output
786

user output
(empty)

#### Test 10

Group: 2

Verdict:

input
500 500 5000
.*.*.**..*.*.**.**..*..**...*....

correct output
1763

user output
(empty)

#### Test 11

Group: 3

Verdict:

input
2000 2000 1
.................................

correct output
489611392

user output
(empty)

#### Test 12

Group: 3

Verdict:

input
2000 2000 5
.................................

correct output
120725884

user output
(empty)

#### Test 13

Group: 3

Verdict:

input
2000 2000 400000
..*..**.**.**.*.***...**.*..**...

correct output
1849

user output
(empty)

#### Test 14

Group: 3

Verdict:

input
2000 2000 200000
***.*....*.*..*....**..*..*.*....

correct output
2665

user output
(empty)

#### Test 15

Group: 3

Verdict:

input
2000 2000 80000
**.**...*.***.**....**.*....*....

correct output
5587

user output
(empty)