src.cpp: In function 'int main()':
src.cpp:6:29: error: 'r' was not declared in this scope
freopen("OREHNJACA.INP",r,stdin);
^
src.cpp:7:30: error: 'w' was not declared in this scope
freoopen("OREHNJACA.OUT",w,stdout);
^
src.cpp:7:38: error: 'freoopen' was not declared in this scope
freoopen("OREHNJACA.OUT",w,stdout);
^