Compilare: user.cpp: In function ‘int main()’: user.cpp:50:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 1; i <= N; i ++ ) { ^ user.cpp:58:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while( i <= N ) { ^ user.cpp:46:43: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen( "decrease.in" , "r", stdin ); ^ user.cpp:47:43: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen( "decrease.out", "w", stdout ); ^ user.cpp:49:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf( "%d", &N ); ^ user.cpp:51:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf( "%d", &A[i] ); ^