Programmer Think

explain 1. The efficiency of all the following algorithms shows that most of them are measured by themselves or through OJ on the network 2. Some (about 80%) codes come from OJ of other bloggers or networks 3. Update as soon as you think of it 4. It is applicable to xcpc, blue bridge and other algorithm competitions 5. I'm a konjaku, wh ...

Day 1 AcWing 2041. Haystack Simple prefix and, plus a little bit of read in optimization int main() { n = read() , k = read(); for( int i = 1 , l , r ; i <= k ; i ++ ) { l = read() , r = read(); a[ l ] ++ , a[ r + 1 ] --; } for( int i = 1 ; i <= n ; i ++ ) a[i] += a[ i - 1 ]; sort( a + 1 , a + 1 + ...