0_0_28547969_27455.cpp: In function 'int main()': 0_0_28547969_27455.cpp:29:13: error: 'n' was not declared in this scope while(r<=n)//O(n)遍历 ^ 0_0_28547969_27455.cpp:44:7: error: 'vis' was not declared in this scope vis[a[l]]--; ^