Compilare: user.cpp: In function ‘void read()’: user.cpp:179:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < cop[i].size(); ++ j) { ~~^~~~~~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:220:3: warning: this ‘else’ clause does not guard... [-Wmisleading-indentation] else ^~~~ user.cpp:222:2: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the ‘else’ return 0; ^~~~~~ user.cpp: In member function ‘char InParser::read_ch()’: user.cpp:15:38: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff, 1, 4096, fin); ^