View Compilation Error

0_0_32413177_8581.cpp: In function 'int main()':
0_0_32413177_8581.cpp:40:24: error: 'l' was not declared in this scope
         scanf("%d%d", &l, &r);
                        ^
0_0_32413177_8581.cpp:40:28: error: 'r' was not declared in this scope
         scanf("%d%d", &l, &r);
                            ^