foo.cc: In function 'void init()':
foo.cc:105:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
     for(m=1;m<k;m<<=1);k=m;
     ^~~
foo.cc:105:24: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
     for(m=1;m<k;m<<=1);k=m;
                        ^
foo.cc: In function 'int main()':
foo.cc:236:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%s",s+1);
         ~~~~~^~~~~~~~~~

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