agnostic123：n_input=int(input()) m_input=int(input()) str_mn=input() total_list=[] sum=0 matrixA=[]#状态矩阵 for i in range(n_input):     matrixA.append([False]*m_input) mn_list=str_mn.split(' ') for i in range(n_input):      total_list.append(mn_list[i*m_input:(i+1)*m_input]) # print(total_list) for n_i in range(len(total_list)-1):     for m_j in range(len(total_list[n_i])-1):         if matrixA[n_i][m_j]!=True:             print(total_list[n_i][m_j])             if int(total_list[n_i][m_j])==1 and int(total_list[n_i][m_j+1])==1 and int(total_list[n_i+1][m_j])==1 and int(total_list[n_i+1][m_j+1])==1:                 sum+=1                 matrixA[n_i][m_j]=True                 matrixA[n_i][m_j+1]=True                 matrixA[n_i+1][m_j]=True                  matrixA[n_i+1][m_j+1]=True         else:             continue print(sum)