Compilare: user.cpp: In function ‘std::pair<int, int> pop()’: user.cpp:50: warning: comparison between signed and unsigned integer expressions user.cpp:52: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void dijkstra(int)’: user.cpp:79: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:108: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:121: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result