Compilare: user.cpp: In function ‘bool verif()’: user.cpp:24:28: warning: suggest parentheses around comparison in operand of ‘&’ [-Wparentheses] return (h>0 && o>0 && h<=n & o<=n && seen[v[b].x][v[b].y]>=seen[h][o] && a[h][o]>a[v[b].x][v[b].y]); ^ user.cpp: In function ‘int nextint()’: user.cpp:52:49: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(s[ch]>='0' && s[ch]<='9' && ch<s.size()) ^