Compilare: user.cpp: In function ‘base solve(int, int)’: user.cpp:91:36: warning: statement has no effect [-Wunused-value] eprintf("l = %d, r = %d\n",l,r); ^ user.cpp: In function ‘int main()’: user.cpp:120:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("spirt.in","r",stdin); ^ user.cpp:121:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("spirt.out","w",stdout); ^ user.cpp:130:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf(" %s", s + 1); ^ user.cpp: In function ‘int read()’: user.cpp:42:40: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] inline int read(){int x;scanf(" %d",&x);return x;} ^