Compilare: main.cpp: In function 'int main()': main.cpp:30:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0 ; j < cost[i].size() ; ++j){ ~~^~~~~~~~~~~~~~~~ main.cpp:35:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (k = 0 ; k < v[nod].size() ; ++k){ ~~^~~~~~~~~~~~~~~ main.cpp:12:35: 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,&q); ^ main.cpp:14:39: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d%d",&x,&y,&z); ^ main.cpp:19:34: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d",&x,&t); ^