Compilare: main.cpp: In function 'int main()': main.cpp:169:9: warning: unused variable 'st' [-Wunused-variable] int st=0; ^~ main.cpp:170:9: warning: unused variable 'dr' [-Wunused-variable] int dr=n; ^~ main.cpp:143:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("necromancer.in","r",stdin); ^ main.cpp:144:42: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("necromancer.out","w",stdout); ^ main.cpp:146:28: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buff,1,dim,stdin); ^ main.cpp: In function 'void read(int&)': main.cpp:127:36: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buff,1,dim,stdin); ^ main.cpp:137:36: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buff,1,dim,stdin); ^