47 lines
1.4 KiB
C++
47 lines
1.4 KiB
C++
|
#include <cstdint>
|
||
|
|
#include <iostream>
|
||
|
|
#include <vector>
|
||
|
|
|
||
|
|
int main() {
|
||
|
|
const std::uint32_t forward = 'X' << 24 | 'M' << 16 | 'A' << 8 | 'S';
|
||
|
|
const std::uint32_t reverse = 'S' << 24 | 'A' << 16 | 'M' << 8 | 'X';
|
||
|
|
std::uint32_t horizontal = 0;
|
||
|
|
std::vector<std::uint32_t> vertical, pos_diag, neg_diag;
|
||
|
|
|
||
|
|
int count = 0;
|
||
|
|
int line = 0;
|
||
|
|
int pos = 0;
|
||
|
|
int width = 0;
|
||
|
|
char c;
|
||
|
|
std::cin >> std::noskipws;
|
||
|
|
while (std::cin.get(c)) {
|
||
|
|
horizontal = horizontal << 8 | c;
|
||
|
|
count += horizontal == forward || horizontal == reverse;
|
||
|
|
if (c == '\n') {
|
||
|
|
width = pos;
|
||
|
|
pos = 0;
|
||
|
|
horizontal = 0;
|
||
|
|
pos_diag[line] = 0;
|
||
|
|
neg_diag[width - 1 - line] = 0;
|
||
|
|
line++;
|
||
|
|
continue;
|
||
|
|
} else if (line == 0) {
|
||
|
|
vertical.emplace_back(c);
|
||
|
|
pos_diag.emplace_back(c);
|
||
|
|
neg_diag.emplace_back(c);
|
||
|
|
} else {
|
||
|
|
vertical[pos] = vertical[pos] << 8 | c;
|
||
|
|
count += vertical[pos] == forward || vertical[pos] == reverse;
|
||
|
|
auto &pos_diag_elem = pos_diag[(pos + line) % width];
|
||
|
|
pos_diag_elem = pos_diag_elem << 8 | c;
|
||
|
|
count += pos_diag_elem == forward || pos_diag_elem == reverse;
|
||
|
|
auto &neg_diag_elem = neg_diag[((pos - line) % width + width) % width];
|
||
|
|
neg_diag_elem = neg_diag_elem << 8 | c;
|
||
|
|
count += neg_diag_elem == forward || neg_diag_elem == reverse;
|
||
|
|
}
|
||
|
|
pos++;
|
||
|
|
}
|
||
|
|
std::cout << count << std::endl;
|
||
|
|
return EXIT_SUCCESS;
|
||
|
|
}
|