concurs3.cpp: In function 'int main()': concurs3.cpp:5: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result concurs3.cpp:6: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result concurs3.cpp:7: warning: 'bh' may be used uninitialized in this function concurs3.cpp:7: warning: 'ah' may be used uninitialized in this function concurs3.cpp:7: warning: 'ax' may be used uninitialized in this function concurs3.cpp:7: warning: 'bx' may be used uninitialized in this function