Compilare: main.cpp: In function 'void displayAdd()': main.cpp:96:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < ans.size(); i++) ~~^~~~~~~~~~~~ main.cpp:100:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < ans.size(); i++){ ~~^~~~~~~~~~~~ main.cpp: In function 'void displayDelete()': main.cpp:115:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < fDelete.size(); i++){ ~~^~~~~~~~~~~~~~~~ main.cpp: In function 'void Read(int&)': main.cpp:39:42: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(f, MAX, 1, IN), pos = 0; ^ main.cpp:44:42: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(f, MAX, 1, IN), pos = 0; ^