Compilare: user.cpp: In function ‘bool inauntru(const int&, const int&)’: user.cpp:23:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] return x >= 1 && x <= n && y >= 1 && y <= m; ^ user.cpp:23:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] return x >= 1 && x <= n && y >= 1 && y <= m; ^ user.cpp: In function ‘void lee(int, int, int, int)’: user.cpp:27:20: warning: unused variable ‘t’ [-Wunused-variable] int i, xx, yy, t; ^ user.cpp: In function ‘int main()’: user.cpp:57:18: warning: suggest parentheses around ‘+’ inside ‘>>’ [-Wparentheses] f >> s[i]+1; ^