https://www.luogu.org/problemnew/show/P1006

類似于https://www.luogu.org/problemnew/show/P1002

/* *@Author: STZG *@Language: C++ */ #include <bits/stdc++.h> #include<iostream> #include<algorithm> #include<cstdlib> #include<cstring> #include<cstdio> #include<string> #include<vector> #include<bitset> #include<queue> #include<deque> #include<stack> #include<cmath> #include<list> #include<map> #include<set> //#define DEBUGusing namespace std; typedef long long ll; const int N=55; const double PI = acos(-1.0); const double EXP = 1E-8; const int INF = 0x3f3f3f3f; int t,n,m; int a[N][N]; int dp[N][N][N][N]; int main() { #ifdef DEBUGfreopen("input.in", "r", stdin);//freopen("output.out", "w", stdout); #endifscanf("%d%d",&n,&m);for(int i=1;i<=n;i++)for(int j=1;j<=m;j++)scanf("%d",&a[i][j]);for(int i=1;i<=n;i++)for(int j=1;j<=m;j++)for(int k=1;k<=n;k++){int l=i+j-k;if(l<=0)break;if(l>m)continue;dp[i][j][k][l]=max(dp[i-1][j][k-1][l],max(dp[i-1][j][k][l-1],max(dp[i][j-1][k][l-1],dp[i][j-1][k-1][l])));if(i==k&&j==l)dp[i][j][k][l]+=a[i][j];elsedp[i][j][k][l]+=a[i][j]+a[k][l];}cout << dp[n][m][n][m] << endl;//cout << "Hello world!" << endl;return 0; }

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