[機率dp] ZOJ 3822 Domination,zoj3822題意:給N×M的棋盤,每天隨機找一個沒放過棋子的格子放一個棋子問使得每個每列都有棋子的天數期望思路:dp[i][j][k] 代表放了i個棋子佔了j行k列 到達目標狀態的期望然後從 dp[n*m][n][m] 往後遞推就好了。因為知道了有i個棋子 例如一個狀態dp[6][3][3]x x x o o ox o o o o ox o x o o oo o o o o o對於 dp[i+1][3][3]
java HashMap中出現重複的key, 求解釋,javahashmap上代碼: Person p1 = new Person("xiaoer",1); Person p2 = new Person("san",4); Map<Person,String> maps = new HashMap<Person,String>(); maps.put(p1, "11
2014ACM/ICPC亞洲地區賽牡丹江站現場賽-K ( ZOJ 3829 ) Known Notation,2014acmicpcKnown NotationTime Limit: 2 Seconds Memory Limit: 65536 KBDo you know reverse Polish notation (RPN)? It is a known notation in the area of
ZOJ3829 ACM-ICPC 2014 亞洲地區賽牡丹江賽區現場賽K題 Known Notation 貪心,zoj3829acm-icpcKnown NotationTime Limit: 2 Seconds Memory Limit: 131072 KBDo you know reverse Polish notation (RPN)? It is a known notation in the area