function equalStacks(h1: number[], h2: number[], h3: number[]): number {
    let maxHeight:number = 0;
    let mapSimilar: Record<number, number> = {}
    let initArrays = [h1, h2, h3];
    function sumArray(values: number[]) { 
      let prev = 0;
      let value= 0;
      for(let i= values.length -1; i>=0; i--) {
        value= prev + values[i];
        if(!mapSimilar[value]) {
          mapSimilar[value] = 0;
        }
        mapSimilar[value]++;
        prev = value;
      } 
    }
    initArrays.forEach((subArray) => sumArray(subArray));
    for(const key in mapSimilar) {
      if(mapSimilar[key] === initArrays.length) {
        maxHeight = Math.max(maxHeight,  parseInt(key))
      }
    }
    return maxHeight;
}