View Compilation Error

0_0_25070872_9214.cpp:96:11: error: redefinition of 'const int mod'
 const int mod = 1000000007;
           ^
0_0_25070872_9214.cpp:23:11: note: 'const int mod' previously defined here
 const int mod = 1000000007;
           ^
0_0_25070872_9214.cpp: In function 'int main()':
0_0_25070872_9214.cpp:97:5: error: redefinition of 'int main()'
 int main()
     ^
0_0_25070872_9214.cpp:24:5: note: 'int main()' previously defined here
 int main()
     ^