Compilare: main.cpp: In function 'int main()': main.cpp:55:31: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("ssm.in", "r", stdin); ^ main.cpp:56:33: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("ssm.out", "w", stdout); ^ main.cpp: In function 'char next()': main.cpp:13:39: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buffer, 1, BUFFER_SIZE, stdin); ^ main.cpp: In function 'int main()': main.cpp:78:12: warning: 'last_pos' may be used uninitialized in this function [-Wmaybe-uninitialized] ++last_pos; ^ main.cpp:77:16: warning: 'starting_pos' may be used uninitialized in this function [-Wmaybe-uninitialized] ++starting_pos; ^