/in/foo.cc: In function 'void work()':
/in/foo.cc:4:20: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
 #define rep(i,a,b) for(int (i)=(a);(i)<=(b);(i)++)
                    ^
/in/foo.cc:74:5: note: in expansion of macro 'rep'
     rep(l,1,m) 
     ^~~
/in/foo.cc:76:5: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
     spfa();
     ^~~~