const inp = require('fs').readFileSync('/dev/stdin', 'utf8'); const l = inp.trim().split('\n'); var n = null; var ind = 0; while (li = l.shift()) { const isN = ind % 2 === 0; const nAr = li.split(' '); if(isN){ n = nAr[0]; } else { var sSc = null; for(var i = 0; i < nAr.length; i++){ for(var j = i+1; j < nAr.length; j++){ let sDi = Math.abs(nAr[i] - nAr[j]); if(sSc === null){ sSc = sDi; } else { if(sDi < sSc){ sSc = sDi; } } } } n = null; console.log(sSc); } ind ++; } 
