0_0_15764372_15285.cpp:54:17: error: stray '\241' in program f[v][k] += f[pre][k-d]-((k-d==0)?0:f[tp][k-d-1]); ///用祖先来更新v ^ 0_0_15764372_15285.cpp:54:17: error: stray '\241' in program