Compilare: user.cpp: In function ‘void add_edges(int)’: user.cpp:33: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘bool BFS(int)’: user.cpp:55: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int flux(int)’: user.cpp:82: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:115: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:118: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:124: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result