Compilare: user.cpp: In member function ‘void Graph::read(FILE*)’: user.cpp:87:41: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(file, "%d", &number_of_vertices); ^ user.cpp:91:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(file, "%d", &cost); ^ user.cpp: In function ‘int main()’: user.cpp:216:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("royfloyd.out", "w", stdout); ^ user.cpp:225:26: warning: ‘source’ is used uninitialized in this function [-Wuninitialized] floyd(source, target); ^ user.cpp:225:26: warning: ‘target’ is used uninitialized in this function [-Wuninitialized]