message.cpp: In function 'void send_message(std::vector<bool>, std::vector<bool>)':
message.cpp:25:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<bool>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   25 |     while (msg_pos < M.size()) {
      |            ~~~~~~~~^~~~~~~~~~
message.cpp:28:34: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<bool>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   28 |             if (!C[i] && msg_pos < M.size()) {
      |                          ~~~~~~~~^~~~~~~~~~
message.cpp:26:13: warning: unused variable 'envio_pos' [-Wunused-variable]
   26 |         int envio_pos = 0;
      |             ^~~~~~~~~
message.cpp:6:9: warning: unused variable 'pos' [-Wunused-variable]
    6 |     int pos = 0;
      |         ^~~
message.cpp:7:9: warning: unused variable 'cnt' [-Wunused-variable]
    7 |     int cnt = 0;
      |         ^~~
message.cpp: In function 'std::vector<bool> receive_message(std::vector<std::vector<bool> >)':
message.cpp:66:23: warning: comparison of integer expressions of different signedness: 'std::vector<bool>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   66 |     while (sec.size() > largo) {
      |            ~~~~~~~~~~~^~~~~~~