0_0_11053919_19026.c:1:18: cstdio: No such file or directory 0_0_11053919_19026.c:2:19: cstring: No such file or directory 0_0_11053919_19026.c:3:21: algorithm: No such file or directory 0_0_11053919_19026.c:5: error: syntax error before "namespace"