0_0_31846196_28213.c:1:1: error: expected identifier or '(' before '/' token
//#pragma GCC optimize(2)
^
0_0_31846196_28213.c:1:3: error: stray '#' in program
//#pragma GCC optimize(2)
^
0_0_31846196_28213.c:2:17: fatal error: cstdio: No such file or directory
#include<cstdio>
^
compilation terminated.
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