/in/foo.cc: In function 'int main()':
/in/foo.cc:37:12: warning: 'k' may be used uninitialized in this function [-Wmaybe-uninitialized]
     qt[k]++; return res;
            ^
/in/foo.cc:33:22: note: 'k' was declared here
     int res = -Maxn, k;
                      ^
/in/foo.cc:37:12: warning: 'k' may be used uninitialized in this function [-Wmaybe-uninitialized]
     qt[k]++; return res;
            ^
/in/foo.cc:33:22: note: 'k' was declared here
     int res = -Maxn, k;
                      ^