Tontti

#!/usr/bin/env python
# -*- coding: utf-8 -*-
 
from sys import stdin
 
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 range(n):
        metsa.append(map(is_star, readline()))
        
    vaihtoehtoja = 0
 
    sqrt_x = isqrt(x) - 1
    
    for x1 in xrange(n-sqrt_x):
        next_x_bars = []
        for y1 in xrange(m):
            bar_height = y1+1
            bar = 0
            for x2 in xrange(x1, min(x1+bar_height, n)):
                if metsa[x2][y1]:
                    bar += 1
            next_x_bars.append(bar)
        
        for y1 in xrange(m-sqrt_x):
            val = 0
            for w in xrange(1, min(n-x1+1, m-y1+1)):
                t_x2 = x1+w-1
                t_y2 = y1+w-1
                # for x2 in xrange(x1, x1+w):
                #     if metsa[x2][t_y2]:
                #         val += 1
                val += next_x_bars[t_y2]
                for y2 in xrange(y1, t_y2):
                    if metsa[t_x2][y2]:
                        val += 1
                if val == x:
                    vaihtoehtoja += 1
                # Prepare for next
                # print(str(y1)+': '+str(next_x_bars))
                # print(vaihtoehtoja)
                if w != 1:
                    if metsa[t_x2][t_y2]:
                        next_x_bars[t_y2] -= 1
                        if next_x_bars[t_y2] < 0:
                            raise
    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