Compilare: user.cpp: In function ‘void recomp(node*)’: user.cpp:62:38: warning: statement has no effect [-Wunused-value] if (act->son[0]) act->son[0]->sum; ^ user.cpp:63:38: warning: statement has no effect [-Wunused-value] if (act->son[1]) act->son[1]->sum; ^ user.cpp: In function ‘int main()’: user.cpp:165:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("grau.in","r",stdin); ^ user.cpp:166:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("grau.out","w",stdout); ^ user.cpp:168:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:170:40: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &Q[i].x, &Q[i].y); ^ user.cpp:176:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &m); ^ user.cpp:178:52: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &Q[i].tp, &Q[i].x, &Q[i].y); ^