Compilare: user.cpp: In function ‘int main()’: user.cpp:14:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 1; i <= N; i ++ ) { ^ user.cpp:10:43: 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:11:43: 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:13:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf( "%d", &N ); ^ user.cpp:15:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf( "%d", &V[i] ); Dp[i] = Nr[i] = 1; ^