Compilare: user.cpp: In function ‘int main()’: user.cpp:13:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 2; i <= n; i ++) ^ user.cpp:15:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 1; i <= n; i ++) ^ user.cpp:17:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 1; i <= lg[n]; i ++) ^ user.cpp:18:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 1; j <=n - (1<<(i-1)); j ++) ^ user.cpp:20:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 1; i <= m; i ++) ^