0_0_20654425_17465.cpp: In function 'int main()':
0_0_20654425_17465.cpp:63:46: error: 'memset' was not declared in this scope
memset(mark,0,sizeof(mark));
^
0_0_20654425_17465.cpp:69:46: error: 'memset' was not declared in this scope
memset(mark,0,sizeof(mark));
^
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