terminate called after throwing an instance of 'std::bad_alloc' what(): std::bad_alloc

This error message indicates that a program has attempted to allocate more memory than is available, resulting in a failure to allocate memory. The program then throws a std::bad_alloc exception to signal that the allocation has failed. This error can occur for a variety of reasons, such as running out of memory, heap corruption, or other issues. To fix this error, you may need to investigate the memory usage of your program and ensure that it is not exceeding the available memory. Additionally, you may need to review your code to identify and fix any memory leaks or other issues that could be causing memory problems.