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:153: warning: comparison between signed and unsigned integer expressions user.cpp:175: warning: comparison between signed and unsigned integer expressions user.cpp:214: warning: comparison between signed and unsigned integer expressions user.cpp: In function 'void df(int)': user.cpp:241: warning: comparison between signed and unsigned integer expressions user.cpp:263: warning: comparison between signed and unsigned integer expressions user.cpp:266: warning: comparison between signed and unsigned integer expressions user.cpp:272: warning: comparison between signed and unsigned integer expressions user.cpp:276: warning: comparison between signed and unsigned integer expressions user.cpp:286: warning: comparison between signed and unsigned integer expressions user.cpp:315: warning: comparison between signed and unsigned integer expressions user.cpp:326: warning: comparison between signed and unsigned integer expressions user.cpp:332: warning: comparison between signed and unsigned integer expressions user.cpp: In function 'int main()': user.cpp:379: warning: comparison between signed and unsigned integer expressions