split.cpp: In function 'int main()': split.cpp:5: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result split.cpp:6: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result split.cpp:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result split.cpp:12: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result split.cpp:7: warning: 'i1' may be used uninitialized in this function split.cpp:7: warning: 'j1' may be used uninitialized in this function split.cpp:7: warning: 'k1' may be used uninitialized in this function split.cpp:7: warning: 'i2' may be used uninitialized in this function split.cpp:7: warning: 'k2' may be used uninitialized in this function