View Compilation Error

0_0_25209418_1162.cpp: In function 'int solve()':
0_0_25209418_1162.cpp:13:3: error: 'ret' was not declared in this scope
   ret += (c[i] + 10) * p[i];
   ^
0_0_25209418_1162.cpp:29:9: error: 'ret' was not declared in this scope
  return ret;
         ^