0_0_1829480_18085.c:1:17: cmath: No such file or directory 0_0_1829480_18085.c:2:18: cstdio: No such file or directory 0_0_1829480_18085.c:3:21: algorithm: No such file or directory 0_0_1829480_18085.c:4: error: syntax error before "namespace"