Borderou de evaluare (job #23498)

Compilare: user.cpp: In function ‘int valid()’: user.cpp:126:52: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:153:47: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:191:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:206:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:229:60: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:185:13: warning: unused variable ‘kkk’ [-Wunused-variable] user.cpp:277:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:292:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:315:60: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:271:13: warning: unused variable ‘kkk’ [-Wunused-variable] user.cpp: In function ‘int main()’: user.cpp:385:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result]