View Compilation Error

0_0_19095195_10992.cpp: In function 'bool spfa()':
0_0_19095195_10992.cpp:70:30: error: expected primary-expression at end of input
     for(int i = pre[u]; i + 1;
                              ^
0_0_19095195_10992.cpp:70:30: error: expected ')' at end of input
0_0_19095195_10992.cpp:70:30: error: expected statement at end of input
0_0_19095195_10992.cpp:70:30: error: expected '}' at end of input