Compilare: main.cpp: In function 'int main()': main.cpp:35:30: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d",&n,&m); ^ main.cpp:38:90: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d%d%d%d",&mch[i].first,&mch[i].second,&ec[i].a,&ec[i].b,&ec[i].c); ^ main.cpp:72:18: warning: 'maxi' may be used uninitialized in this function [-Wmaybe-uninitialized] cross[elem+1]=maxi; ~~~~~~~~~~~~~^~~~~ main.cpp:71:13: warning: 'mini' may be used uninitialized in this function [-Wmaybe-uninitialized] cross[0]=mini; ~~~~~~~~^~~~~