caravane.cpp: In function 'void citire()': caravane.cpp:19: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result caravane.cpp: In function 'void det(int)': caravane.cpp:42: warning: comparison between signed and unsigned integer expressions caravane.cpp: In function 'void DFS(int)': caravane.cpp:52: warning: comparison between signed and unsigned integer expressions caravane.cpp: In function 'int main()': caravane.cpp:77: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result caravane.cpp:78: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result