Compilare: user.cpp: In function ‘void uniform()’: user.cpp:37: warning: comparison between signed and unsigned integer expressions user.cpp:45: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void solve()’: user.cpp:105: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:120: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result