Compilare: user.cpp: In function ‘int main()’: user.cpp:39:80: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] if( dp[l][j] ) dp[l][j] = MIN( dp[l][j], dp[1-l][j-1] + (1LL<<j-1) * a ); ^ user.cpp:3:23: note: in definition of macro ‘MIN’ #define MIN(a,b)((a)<(b)?(a):(b)) ^ user.cpp:39:80: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] if( dp[l][j] ) dp[l][j] = MIN( dp[l][j], dp[1-l][j-1] + (1LL<<j-1) * a ); ^ user.cpp:3:31: note: in definition of macro ‘MIN’ #define MIN(a,b)((a)<(b)?(a):(b)) ^ user.cpp:40:55: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] else dp[l][j] = dp[1-l][j-1] + (1LL<<j-1) * a; ^ user.cpp:17:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("hacker3.in","r",stdin); ^ user.cpp:18:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("hacker3.out","w",stdout); ^ user.cpp:23:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&N); ^ user.cpp:26:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&a,&b); ^