Compilare: main.cpp: In function 'int main()': main.cpp:14:41: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ( "zoro.in" , "r" , stdin ) ; ^ main.cpp:15:43: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ( "zoro.out" , "w" , stdout ) ; ^ main.cpp:19:34: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf ( "%d%d" , & n , & m ) ; ^ main.cpp:24:34: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf ( "%d" , & x ) ; ^ main.cpp:17:29: warning: 'sp' may be used uninitialized in this function [-Wmaybe-uninitialized] int n , m , i , j , x , sp , ep ; ^~ main.cpp:17:34: warning: 'ep' may be used uninitialized in this function [-Wmaybe-uninitialized] int n , m , i , j , x , sp , ep ; ^~