Compilare: user.cpp: In function ‘int main()’: user.cpp:37: warning: format ‘%d’ expects type ‘int’, but argument 2 has type ‘long long int’ user.cpp:12: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:13: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:15: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:18: warning: ‘start’ may be used uninitialized in this function