0_0_12393816_27946.cpp: In function `long long int dfs(int, int, int, int)':
0_0_12393816_27946.cpp:16: error: `log' undeclared (first use this function)
0_0_12393816_27946.cpp:16: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_12393816_27946.cpp:16: error: expected `;' before "long"
0_0_12393816_27946.cpp:19: error: `ans' undeclared (first use this function)
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