Compilare: user.cpp: In function ‘void scan()’: user.cpp:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘void bellman_ford()’: user.cpp:44: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void ceva()’: user.cpp:61: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void dfs(int)’: user.cpp:73: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void dfs2(int)’: user.cpp:83: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void print()’: user.cpp:108: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:117: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:118: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result