Compilare: main.cpp: In function 'int main()': main.cpp:35:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0 ; i < v[nod].size() ; i++){ ~~^~~~~~~~~~~~~~~ main.cpp:47:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0 ; j < op[nod].size() ; j++){ ~~^~~~~~~~~~~~~~~~ main.cpp:103:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0 ; j < op[nod].size() ; j++){ ~~^~~~~~~~~~~~~~~~ main.cpp:14:35: 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,&k); ^ main.cpp:16:39: 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,&c); ^