dimonb

        auto l = height.begin(), r = height.end() - 1;
        int level = 0, water = 0;
        while (l != r + 1) {
            int lower = *l < *r ? *l++ : *r--;
            level = max(level, lower);
            water += level - lower;
        }

dimonb

        auto l = height.begin(), r = height.end() - 1;
        int level = 0, water = 0;
        while (l != r + 1) {
            int lower = *l < *r ? *l++ : *r--;
            level = max(level, lower);
            water += level - lower;
        }

dimonb

        auto l = height.begin(), r = height.end() - 1;
        int level = 0, water = 0;
        while (l != r + 1) {
            int lower = *l < *r ? *l++ : *r--;
            level = max(level, lower);
            water += level - lower;
        }

dimonb

Keybase proof

I hereby claim:

• I am dimonb on github.
• I am dimonb (https://keybase.io/dimonb) on keybase.
• I have a public key ASA5iOzJrmx8JTZkTDAbONB_tV-gmeqKJTYGZqQ09lqpYAo

To claim this, I am signing this object: