Compilare: main.cpp: In function 'int dij(int, int, int)': main.cpp:54:9: warning: unused variable 'rr' [-Wunused-variable] int rr = 1; ^~ main.cpp: In function 'int main()': main.cpp:123:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("lanterna.out", "w", stdout); ^ main.cpp: In member function 'char InParser::read_ch()': main.cpp:68:34: 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, 262144, fin); ^