Borderou de evaluare (job #23337)

Compilare: user.cpp: In function ‘int valid()’: user.cpp:161:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:176:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:193:60: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:155:13: warning: unused variable ‘kkk’ [-Wunused-variable] user.cpp:241:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:256:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:273:60: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:235:13: warning: unused variable ‘kkk’ [-Wunused-variable] user.cpp: In function ‘int main()’: user.cpp:352:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result]