Eroare de compilare: main.cpp: In function 'int fast_exp(int, int)': main.cpp:15:31: warning: comparison of integer expressions of different signedness: 'size_t' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 15 | for(size_t mask = 1; mask <= p; mask <<= 1) { | ~~~~~^~~~ main.cpp: In function 'int main()': main.cpp:88:5: error: 'input' was not declared in this scope; did you mean 'int'? 88 | input.close(); | ^~~~~ | int main.cpp:89:5: error: 'output' was not declared in this scope 89 | output.close(); | ^~~~~~ Non zero exit status: 1