Compilare: user.cpp: In function ‘int main()’: user.cpp:107: warning: comparison between signed and unsigned integer expressions user.cpp:48: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:49: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:51: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:54: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result user.cpp:67: warning: ‘line’ may be used uninitialized in this function user.cpp:67: warning: ‘column’ may be used uninitialized in this function user.cpp:83: warning: ‘ll’ may be used uninitialized in this function user.cpp:83: warning: ‘cc’ may be used uninitialized in this function /tmp/cca8zh8G.o: In function `main': user.cpp:(.text+0x560): warning: the `gets' function is dangerous and should not be used.