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View Compilation Error

0_0_12878135_12176.cpp:9: error: expected constructor, destructor, or type conversion before '<' token
0_0_12878135_12176.cpp:9: error: expected `,' or `;' before '<' token
0_0_12878135_12176.cpp: In function `void dfs(int)':
0_0_12878135_12176.cpp:30: error: `v' undeclared (first use this function)
0_0_12878135_12176.cpp:30: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_12878135_12176.cpp:36: error: `max' undeclared (first use this function)
0_0_12878135_12176.cpp: In function `bool ok(int, int)':
0_0_12878135_12176.cpp:43: error: `memset' undeclared (first use this function)
0_0_12878135_12176.cpp:48: error: `max' undeclared (first use this function)
0_0_12878135_12176.cpp: In function `int main()':
0_0_12878135_12176.cpp:82: error: `scanf' undeclared (first use this function)
0_0_12878135_12176.cpp:86: error: `v' undeclared (first use this function)
0_0_12878135_12176.cpp:87: error: `memset' undeclared (first use this function)
0_0_12878135_12176.cpp:90: error: `sort' undeclared (first use this function)
0_0_12878135_12176.cpp:97: error: `printf' undeclared (first use this function)


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