Compilare: main.cpp: In function 'int main()': main.cpp:82:13: warning: unused variable 'j' [-Wunused-variable] int t, i, j; ^ main.cpp:83:8: warning: unused variable 'tip' [-Wunused-variable] char tip; ^~~ main.cpp:80:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("easyvect.in", "r", stdin); ^ main.cpp:81:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("easyvect.out", "w", stdout); ^ main.cpp: In function 'char readch()': main.cpp:20:31: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(str, BUFF, 1, stdin); ^