Compilare: user.cpp: In function 'int ok(int, int)': user.cpp:27: warning: comparison between signed and unsigned integer expressions user.cpp:45: warning: comparison between signed and unsigned integer expressions user.cpp:57: warning: comparison between signed and unsigned integer expressions user.cpp:57: warning: comparison between signed and unsigned integer expressions user.cpp:76: warning: comparison between signed and unsigned integer expressions user.cpp:89: warning: comparison between signed and unsigned integer expressions user.cpp:89: warning: comparison between signed and unsigned integer expressions user.cpp:107: warning: comparison between signed and unsigned integer expressions user.cpp:133: warning: comparison between signed and unsigned integer expressions user.cpp:154: warning: comparison between signed and unsigned integer expressions user.cpp:176: warning: comparison between signed and unsigned integer expressions user.cpp:215: warning: comparison between signed and unsigned integer expressions user.cpp: In function 'void df(int)': user.cpp:242: warning: comparison between signed and unsigned integer expressions user.cpp:264: warning: comparison between signed and unsigned integer expressions user.cpp:267: warning: comparison between signed and unsigned integer expressions user.cpp:273: warning: comparison between signed and unsigned integer expressions user.cpp:277: warning: comparison between signed and unsigned integer expressions user.cpp:287: warning: comparison between signed and unsigned integer expressions user.cpp:316: warning: comparison between signed and unsigned integer expressions user.cpp:327: warning: comparison between signed and unsigned integer expressions user.cpp:333: warning: comparison between signed and unsigned integer expressions user.cpp: In function 'int main()': user.cpp:380: warning: comparison between signed and unsigned integer expressions