Borderou de evaluare (job #23450)

Compilare: user.cpp: In function ‘int valid()’: user.cpp:120:52: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:141:47: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:179:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:194:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:211:60: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:173:13: warning: unused variable ‘kkk’ [-Wunused-variable] user.cpp:259:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:274:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:291:60: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:253:13: warning: unused variable ‘kkk’ [-Wunused-variable] user.cpp: In function ‘int main()’: user.cpp:370:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result]