tabara.cpp: In function 'int main()': tabara.cpp:6: warning: unused variable 'l1' tabara.cpp:6: warning: unused variable 'l2' tabara.cpp:6: warning: unused variable 'nr' tabara.cpp:7: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result tabara.cpp:8: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result tabara.cpp:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result tabara.cpp:11: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result