Zoj 3802 easy 2048 again pressure DP

Directly from the past to the next DP, because there are only 500 numbers in total, so the total number of tickets will not exceed 4096, and because it is a flappy 2048 rule, therefore, only a string at the end of the subsequent series is effective, so it can be squashed.

1700 Ms =, it is said that it would be much better to optimize with a rolling Array

#include <cstdio>#include <cstring>#include <iostream>#include <map>#include <set>#include <vector>#include <string>#include <queue>#include <deque>#include <bitset>#include <list>#include <cstdlib>#include <climits>#include <cmath>#include <ctime>#include <algorithm>#include <stack>#include <sstream>#include <numeric>#include <fstream>#include <functional>using namespace std;#define MP make_pair#define PB push_backtypedef long long LL;typedef unsigned long long ULL;typedef vector<int> VI;typedef pair<int,int> pii;const int INF = INT_MAX / 3;const double eps = 1e-8;const LL LINF = 1e17;const double DINF = 1e60;const int maxn = 505;const int maxs = (4096 + 5);int num[maxn],n;int f[maxn][maxs];inline int lowbit(int x) {    return x & -x;}void solve() {    memset(f,-1,sizeof(f));    f[0][0] = 0;    int ans = 0;    for(int i = 1;i <= n;i++) {        for(int j = 0;j < 4096;j++) if(f[i - 1][j] != -1) {            int nownum = num[i], nowst = j, nowval = nownum;            f[i][j] = max(f[i][j], f[i - 1][j]);            while(lowbit(nowst) == (nownum >> 1)) {                nowval += (nownum << 1);                nowst ^= (nownum >> 1);                nownum <<= 1;            }            if(lowbit(nowst) < (nownum >> 1)) nowst = 0;            nowst |= (nownum >> 1);            f[i][nowst] = max(f[i][nowst],f[i - 1][j] + nowval);        }    }    for(int i = 0;i < 4096;i++) ans = max(ans,f[n][i]);    printf("%d\n",ans);}int main() {    int T; scanf("%d",&T);    while(T--) {       scanf("%d",&n);       for(int i = 1;i <= n;i++) {           scanf("%d",&num[i]);       }       solve();    }    return 0;}

 

Zoj 3802 easy 2048 again pressure DP