Compilare: user.cpp: In function ‘int main()’: user.cpp:255: warning: comparison between signed and unsigned integer expressions user.cpp:307: warning: comparison between signed and unsigned integer expressions user.cpp:319: warning: comparison between signed and unsigned integer expressions user.cpp:320: warning: comparison between signed and unsigned integer expressions user.cpp:326: warning: comparison between signed and unsigned integer expressions user.cpp:327: warning: comparison between signed and unsigned integer expressions user.cpp:339: warning: comparison between signed and unsigned integer expressions user.cpp:340: warning: comparison between signed and unsigned integer expressions user.cpp:359: warning: comparison between signed and unsigned integer expressions user.cpp:360: warning: comparison between signed and unsigned integer expressions user.cpp:370: warning: comparison between signed and unsigned integer expressions user.cpp:371: warning: comparison between signed and unsigned integer expressions user.cpp:376: warning: comparison between signed and unsigned integer expressions user.cpp:377: warning: comparison between signed and unsigned integer expressions user.cpp:386: warning: comparison between signed and unsigned integer expressions user.cpp:227: warning: unused variable ‘lastj’ user.cpp:230: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:232: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:234: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:389: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result