Compilare: user.cpp: In function ‘int main()’: user.cpp:16:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; (1<<i) <= p; ++ i) ~~~~~~~^~~~ user.cpp:18:9: warning: this ‘if’ clause does not guard... [-Wmisleading-indentation] if ( ((1<<i) & p) > 0) ^~ user.cpp:21:13: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the ‘if’ a=(a * a) % m; ^ user.cpp:12:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("lgput.in","r",stdin); ^ user.cpp:13:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("lgput.out","w",stdout); ^ user.cpp:14:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &n, &p); ^