Compilare: main.cpp: In function 'int main()': main.cpp:31:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0; j<v[i].size()-1 ; j++){ ~^~~~~~~~~~~~~~ main.cpp:15:42: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d%d%d",&p,&n,&m,&dst); ^ main.cpp:17:34: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d",&x,&y); ^