[BZOJ3997][TJOI2016]组合数学 平面图

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#include 
#include 
#include 
#define N 1050

using namespace std;
typedef long long LL;
int v[N][N],n,m;
LL F[N][N];
void ut(LL &x,LL y) { x = max(x,y); }

int main() {
    int T = 0; scanf("%d",&T);
    while (T--) {
        scanf("%d%d",&n,&m);
        for (int i=1;i<=n;i++) 
            for (int j=1;j<=m;j++) scanf("%d",&v[i][j]);

        for (int i=1;i<=n;i++)
            for (int j=1;j<=m;j++) F[i][j] = 0LL;
        for (int i=n;i>=1;i--)
            for (int j=1;j<=m;j++) {
                ut(F[i][j] , F[i+1][j]);
                ut(F[i][j] , F[i][j-1]);
                ut(F[i][j] , F[i+1][j-1] + v[i][j]);
            }
        printf("%lld\n",F[1][m]);
    }
    return 0;
}