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View Compilation Error

0_0_17974639_6916.c:4:5: error: variably modified 'mex' at file scope
 int mex[N], m;
     ^
0_0_17974639_6916.c: In function 'getSg':
0_0_17974639_6916.c:8:2: error: unknown type name 'bool'
  bool has[N] = { false };
  ^
0_0_17974639_6916.c:8:2: error: variable-sized object may not be initialized
0_0_17974639_6916.c:8:18: error: 'false' undeclared (first use in this function)
  bool has[N] = { false };
                  ^
0_0_17974639_6916.c:8:18: note: each undeclared identifier is reported only once for each function it appears in
0_0_17974639_6916.c:9:2: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
  for (int l = 0; l <= n - m; l++){
  ^
0_0_17974639_6916.c:9:2: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
0_0_17974639_6916.c:15:26: error: 'true' undeclared (first use in this function)
   has[mex[l] ^ mex[r]] = true;
                          ^
0_0_17974639_6916.c:17:2: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
  for (int i = 0;;i++)
  ^
0_0_17974639_6916.c: In function 'main':
0_0_17974639_6916.c:28:3: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
   for (int i = 0; i < m; i++)
   ^


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