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MY TLE的DP#include <iostream> using namespace std; int N; int num[30001]; int dp[30001][2]; int main() { int T; scanf("%d" , &T); while(T --) { int i , j; scanf("%d" , &N); for(i = 1 ; i <= N ; i ++) scanf("%d" , &num[i]); dp[1][0] = dp[1][1] = num[1]; int l1 = 1 , l2 = 1; for(i = 2 ; i <= N ; i ++) { if(dp[1][1] < num[i]) dp[1][1] = num[i]; for(j = 2 ; j < l2 ; j ++) { if(dp[j][0] < num[i] && num[i] > dp[j+1][1]) dp[j+1][1] = num[i]; } for(j = 1 ; j < l1 ; j ++) { if(dp[j][1] > num[i] && num[i] < dp[j+1][0]) dp[j+1][0] = num[i]; } if(dp[l1][0] < num[i] && l1 != 1) { if(l2 <= l1) { l2 = l1 + 1; dp[l2][1] = num[i]; } else if(l1 == l2 + 1 && num[i] > dp[l2][1]) { dp[l2][1] = num[i]; } } if(dp[l2][1] > num[i]) { if(l1 <= l2) { l1 = l2 + 1; dp[l1][0] = num[i]; } else if(l1 == l2 - 1 && num[i] < dp[l1][0]) dp[l1][0] = num[i]; } } if(l1 < l2) l1 = l2; printf("%d\n" , l1); } return 0; } Followed by: Post your reply here: |
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