/in/foo.cc: In function 'int main()':
/in/foo.cc:31:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
     for (register int j=c;j<=n;j++)
     ^~~
/in/foo.cc:41:7: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
       int ans=minx(dp[1][n][0],dp[1][n][1]);//最后比较是在左端还是在右端更小 
       ^~~