Compilare: user.cpp: In function ‘int main()’: user.cpp:24:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d%d",&N,&M,&K); ^ user.cpp:29:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&c[i]); ^ user.cpp:33:40: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d%d",&x,&y,&z); ^ user.cpp:70:47: warning: ‘k’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(viz[i]==0&&d[i]>d[k]+a[i][k]) ^ user.cpp:52:47: warning: ‘k’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(viz[i]==0&&d[i]>d[k]+a[i][k]) ^