View Compilation Error

0_0_17693640_14560.c: In function 'dijkstra':
0_0_17693640_14560.c:18:3: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
   for( int u = 0; u < num_station; u++ )
   ^
0_0_17693640_14560.c:18:3: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
0_0_17693640_14560.c:24:12: error: redefinition of 'u'
   for( int u = 0; u < num_station ; u++ )
            ^
0_0_17693640_14560.c:18:12: note: previous definition of 'u' was here
   for( int u = 0; u < num_station; u++ )
            ^
0_0_17693640_14560.c:24:3: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
   for( int u = 0; u < num_station ; u++ )
   ^
0_0_17693640_14560.c: In function 'main':
0_0_17693640_14560.c:60:3: error: expected expression before '/' token
   //lest_time = last_time = -1, sum_point = 0;
   ^