/in/foo.cc: In function 'void solve()':
/in/foo.cc:129:10: warning: 'dl' may be used uninitialized in this function [-Wmaybe-uninitialized]
    D[dl] = 0;
    ~~~~~~^~~
/in/foo.cc:149:5: warning: 'cl' may be used uninitialized in this function [-Wmaybe-uninitialized]
     if(X[i].x == cl)
     ^~