Compilare: user.cpp: In function ‘int main()’: user.cpp:157:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ( IN , "r" , stdin ) ; ^ user.cpp:158:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ( OUT , "w" , stdout ) ; ^ user.cpp:160:35: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ( "%d %d\n" , &n , &m ) ; ^ user.cpp:161:18: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets ( sir ) ; ^ user.cpp:173:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ( "%d", &tip ) ; ^ user.cpp:177:45: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ( "%d %c\n" , &pos , &c ) ; ^ user.cpp:187:53: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ( "%d %d %d\n" , &a , &b , &len ) ; ^ user.cpp: In function ‘long long unsigned int hasher(int, int)’: user.cpp:115:9: warning: ‘bloc’ may be used uninitialized in this function [-Wmaybe-uninitialized] int bloc ; ^ user.cpp: In function ‘int main()’: user.cpp:88:9: warning: ‘bloc’ may be used uninitialized in this function [-Wmaybe-uninitialized] int bloc ; ^ /tmp/ccSagSyz.o: In function `main': user.cpp:(.text.startup+0x72): warning: the `gets' function is dangerous and should not be used.