0_0_3226413_26691.c:1:19: iostream: No such file or directory 0_0_3226413_26691.c:2:17: cstdio: No such file or directory 0_0_3226413_26691.c:3:17: string: No such file or directory 0_0_3226413_26691.c:6: error: syntax error before "namespace"