Compilare: user.cpp: In function ‘int main(int, const char**)’: user.cpp:135:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i = 2; i < dist.size(); ++i ) { ^ user.cpp:117:15: warning: unused variable ‘src’ [-Wunused-variable] int u, v, d, src; ^ user.cpp:115:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf( f_in, "%d %d", &N, &M); ^ user.cpp:122:39: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f_in, "%d %d %d", &u, &v, &d); ^