717658_0_0_13518.cpp:40: error: stray '\161' in program
717658_0_0_13518.cpp:40: error: stray '\198' in program
717658_0_0_13518.cpp: In function `void dfs(int, int, int)':
717658_0_0_13518.cpp:50: error: `sum' undeclared (first use this function)
717658_0_0_13518.cpp:50: error: (Each undeclared identifier is reported only once for each function it appears in.)
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