Compilare: user.cpp: In function ‘void dij()’: user.cpp:23:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[y].size();i++){ ~^~~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:47:10: warning: statement has no effect [-Wunused-value] for(k;k>0;k--){ ^ user.cpp:52:10: warning: statement has no effect [-Wunused-value] for(m;m>0;m--){ ^ user.cpp:46:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d%d",&n,&m,&k); ^ user.cpp:48:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&i); ^ user.cpp:53:36: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d%d",&i,&j,&c); ^