Compilare: user.cpp: In function ‘int main()’: user.cpp:3:15: warning: suggest parentheses around ‘+’ inside ‘<<’ [-Wparentheses] #define NMax 1<<17 ^ user.cpp:30:17: note: in expansion of macro ‘NMax’ for( best = NMax + 1, i = 1; i <= N; ) ^ user.cpp:3:15: warning: suggest parentheses around ‘+’ inside ‘<<’ [-Wparentheses] #define NMax 1<<17 ^ user.cpp:40:17: note: in expansion of macro ‘NMax’ if( best == NMax + 1 ) printf("-1\n"); ^ user.cpp:16:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("facebook.in","r",stdin); ^ user.cpp:17:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("facebook.out","w",stdout); ^ user.cpp:21:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&N,&K); ^ user.cpp:24:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&e[i].v); ^