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1054269_0_0_25722.cpp:1:23:  stdio.h : No such file or directory
1054269_0_0_25722.cpp:2:24:  stdlib.h : No such file or directory
1054269_0_0_25722.cpp: In function `void make_tree(int, int, Lines_tree*)':
1054269_0_0_25722.cpp:30: error: `NULL' undeclared (first use this function)
1054269_0_0_25722.cpp:30: error: (Each undeclared identifier is reported only once for each function it appears in.)
1054269_0_0_25722.cpp: In function `void init()':
1054269_0_0_25722.cpp:101: error: `scanf' undeclared (first use this function)
1054269_0_0_25722.cpp:108: error: `qsort' undeclared (first use this function)
1054269_0_0_25722.cpp: In function `void work()':
1054269_0_0_25722.cpp:129: error: `abs' undeclared (first use this function)
1054269_0_0_25722.cpp: In function `void output()':
1054269_0_0_25722.cpp:137: error: `printf' undeclared (first use this function)