0_0_14221211_29458.cpp: In function 'int main()': 0_0_14221211_29458.cpp:30:11: error: 'r' was not declared in this scope if(r/2+1==l) { ^ 0_0_14221211_29458.cpp:30:18: error: 'l' was not declared in this scope if(r/2+1==l) { ^