Tontti

#!/usr/bin/env python
# -*- coding: utf-8 -*-

from sys import stdin
import profile

def readline():
    return stdin.readline().strip()

def get_vars():
    global n, m, x
    row1 = readline().split(' ')
    n = int(row1[0]) # Korkeus
    m = int(row1[1]) # Leveys
    x = int(row1[2]) # Tavoite
get_vars()

def isqrt(n):
    x = n
    y = (x + 1) // 2
    while y < x:
        x = y
        y = (x + n // x) // 2
    return x
    

def is_star(char):
    return char == '*'


def run():
    metsa = []
    for i in xrange(n):
        metsa.append(map(is_star, readline()))
    
    vaihtoehtoja = 0

    sqrt_x = isqrt(x) - 1
    
    for w in xrange(max(1, sqrt_x), min(n, m)):
        wi = w - 1
        block = 0
        for row in metsa[:w]:
            block += row[:w].count(True)
        block_orig = block
        for x1 in xrange(n-wi):
            for y1 in xrange(m-wi):
                if block == x:
                    vaihtoehtoja += 1
                
                if not y1 == m-wi-1:
                    diff = 0
                    for x2 in xrange(x1, x1+w):
                        if metsa[x2][y1+w]:
                            diff += 1
                            
                        if metsa[x2][y1]:
                            diff -= 1
                    block += diff
                    
            if not x1 == n-wi-1:
                diff = 0
                for y2 in xrange(w):
                    if metsa[x1+w][y2]:
                        diff += 1
                        
                    if metsa[x1][y2]:
                        diff -= 1
                block_orig += diff
                block = block_orig

    print(vaihtoehtoja)
run()

Test 1

Group: 1

Verdict: ACCEPTED

Test 2

Group: 1

Verdict: ACCEPTED

Test 3

Group: 1

Verdict: ACCEPTED

Test 4

Group: 1

Verdict: ACCEPTED

Test 5

Group: 1

Verdict: ACCEPTED

Test 6

Group: 2

Verdict: TIME LIMIT EXCEEDED

Test 7

Group: 2

Verdict: TIME LIMIT EXCEEDED

Test 8

Group: 2

Verdict: TIME LIMIT EXCEEDED

Test 9

Group: 2

Verdict: TIME LIMIT EXCEEDED

Test 10

Group: 2

Verdict: TIME LIMIT EXCEEDED

Test 11

Group: 3

Verdict: TIME LIMIT EXCEEDED

Test 12

Group: 3

Verdict: TIME LIMIT EXCEEDED

Test 13

Group: 3

Verdict: TIME LIMIT EXCEEDED

Test 14

Group: 3

Verdict: TIME LIMIT EXCEEDED

Test 15

Group: 3

Verdict: TIME LIMIT EXCEEDED