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i calMax || avgSul < sulMin || avgSul > sulMax) return null;\n if (avgAsh < ashMin || avgAsh > ashMax || avgWater < waterMin || avgWater > waterMax) return null;\n if (avgVol < volMin || avgVol > volMax) return null;\n let maxTons = 0, tbw = 0;\n const dem = [];\n for (let i=0; i 0) {\n let mb = Infinity;\n for (const d of dem) {\n const s = coalData[d.idx].stock;\n if (s <= 0) { mb = 0; break; }\n mb = Math.min(mb, Math.floor(s/d.need));\n }\n maxTons = Math.round(mb*tbw*100)/100;\n }\n return {totalShovels: combo.reduce((a,b)=>a+b,0), combo, avgCalorie: avgCal, avgSulfur: Math.round(avgSul*1e4)/1e4, avgAsh: Math.round(avgAsh*100)/100, avgWater: Math.round(avgWater*100)/100, avgVolatile: Math.round(avgVol*100)/100, totalCost: Math.round(cost*100)/100, maxTonnage: maxTons};\n}\n\nfunction branchAndBound(coalData, params) {\n const {maxShovels, calorieMin, calorieMax, sulfurMin, sulfurMax, ashMin, ashMax, waterMin, waterMax, volatileMin, volatileMax, useWeighted} = params;\n const sulMin = sulfurMin!==''?+sulfurMin:-Infinity, sulMax = sulfurMax!==''?+sulfurMax:Infinity;\n const ashMin_ = ashMin!==''?+ashMin:-Infinity, ashMax_ = ashMax!==''?+ashMax:Infinity;\n const waterMin_ = waterMin!==''?+waterMin:-Infinity, waterMax_ = waterMax!==''?+waterMax:Infinity;\n const volMin = volatileMin!==''?+volatileMin:-Infinity, volMax = volatileMax!==''?+volatileMax:Infinity;\n const constraints = [calorieMin, calorieMax, sulMin, sulMax, ashMin_, ashMax_, waterMin_, waterMax_, volMin, volMax];\n const indices = Array.from({length: coalData.length}, (_,i)=>i).sort((a,b)=>coalData[a].price - coalData[b].price);\n const sortedCoals = indices.map(i=>coalData[i]);\n const minPrices = [];\n let minPP = Infinity;\n for (let i=sortedCoals.length-1; i>=0; i--) {\n if (sortedCoals[i].price < minPP) minPP = sortedCoals[i].price;\n minPrices[i] = minPP;\n }\n let totalCombos = 0;\n const allResults = [];\n for (let n=1; n<=maxShovels; n++) {\n let upperBound = Infinity;\n const greedy = (()=>{\n const combo = Array(sortedCoals.length).fill(0);\n let rem = n;\n for (let i=0; i0; i++) {\n combo[i] = rem;\n const r = evaluateCombo(sortedCoals, combo, useWeighted, constraints);\n if (r) { rem=0; break; }\n combo[i] = 0;\n }\n return rem>0 ? null : evaluateCombo(sortedCoals, combo, useWeighted, constraints);\n })();\n if (greedy) upperBound = greedy.totalCost;\n const current = Array(sortedCoals.length).fill(0);\n (function dfs(idx, rem, curCost) {\n if (rem === 0) {\n const r = evaluateCombo(sortedCoals, current, useWeighted, constraints);\n if (r && r.totalCost < upperBound) {\n upperBound = r.totalCost;\n allResults.push({...r, combo: current.slice()});\n totalCombos++;\n }\n return;\n }\n if (idx === sortedCoals.length-1) {\n current[idx] = rem;\n const r = evaluateCombo(sortedCoals, current, useWeighted, constraints);\n if (r && r.totalCost < upperBound) {\n upperBound = r.totalCost;\n allResults.push({...r, combo: current.slice()});\n totalCombos++;\n }\n current[idx] = 0;\n return;\n }\n const minCost = minPrices[idx+1] || 0;\n for (let k=0; 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Diff · v5