I was doing problem towers.I sorted all the blocks according to weight + strength from exchange arguments and then now i did not get idea how to do transitions in dp ,but i saw some code and i thought i should do it by weights from 0 to total weight (but i do not know why) and the transition was

Your code here...

for (auto block : blocks) {
int w = block.w, s = block.s; ll v = block.v;
for (int i = w + s; i >= w; i--) 
dp[i] = max(dp[i], dp[i - w] + v);
}

Please help me how to take the dp state and also the transitions mainly(i did not understand after thinking a lot) Thank you