traseu3.cpp: In function 'int main()': traseu3.cpp:87: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result traseu3.cpp:88: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result traseu3.cpp:89: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result traseu3.cpp:90: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result traseu3.cpp:91: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result traseu3.cpp:94: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result