View Compilation Error

0_0_17782493_14030.cpp: In function 'void floyd()':
0_0_17782493_14030.cpp:4:21: error: 'n' was not declared in this scope
     for(k = 1; k <= n; k++)  
                     ^
0_0_17782493_14030.cpp:10:20: error: 'Map' was not declared in this scope
                 if(Map[i][j] > Map[i][k] + Map[k][j])  
                    ^
0_0_17782493_14030.cpp:13:21: error: 'pre' was not declared in this scope
                     pre[i][j] = pre[k][j];//记录   
                     ^