foo.cc: In function 'int find(int, int)':
foo.cc:56:17: warning: unused variable 'ans' [-Wunused-variable]
     int las=0,w,ans=0;
                 ^~~
foo.cc: In function 'int main()':
foo.cc:25:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    scanf("%d%d",&l,&r); 
    ~~~~~^~~~~~~~~~~~~~
foo.cc: In function 'int idx(char)':
foo.cc:34:14: warning: 'v' is used uninitialized in this function [-Wuninitialized]
     if(v>='a'&&v<='z')
        ~~~~~~^~~~~~~~

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