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I get TLE, anyone know why?

#include <iostream>

#define MIN(a, b) (a < b ? a : b)
#define MAX(a, b) (a > b ? a : b)

int main()
{
char grid[101][101];
int length, width;
int field = 1;
std::cin >> length >> width;
std::cin.get();
while (length != 0 && width != 0)
{
std::cin.get();
if ...