View Compilation Error

0_0_37993353_26576.cpp: In function 'long long int dfs(long long int, long long int)':
0_0_37993353_26576.cpp:47:9: error: redeclaration of 'long long int res'
     int res = 0;
         ^
0_0_37993353_26576.cpp:46:9: note: 'long long int res' previously declared here
     int res = 0;
         ^