segm.cpp: In function 'int main()': segm.cpp:7: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result segm.cpp:8: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result segm.cpp:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result segm.cpp:13: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result segm.cpp:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result segm.cpp:11: warning: 'w' is used uninitialized in this function segm.cpp:9: warning: 'maxd' may be used uninitialized in this function segm.cpp:9: warning: 'x' may be used uninitialized in this function