View Compilation Error

0_0_9769360_26643.c:1: error: syntax error before '<' token
0_0_9769360_26643.c:2:18: cstdio: No such file or directory
0_0_9769360_26643.c: In function `main':
0_0_9769360_26643.c:6: error: `__int64' undeclared (first use in this function)
0_0_9769360_26643.c:6: error: (Each undeclared identifier is reported only once
0_0_9769360_26643.c:6: error: for each function it appears in.)
0_0_9769360_26643.c:6: error: syntax error before "a"
0_0_9769360_26643.c:7: error: `a' undeclared (first use in this function)
0_0_9769360_26643.c:22: error: syntax error before "sum"
0_0_9769360_26643.c:25: error: `sum' undeclared (first use in this function)