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View Compilation Error

0_0_32260020_29072.cpp: In function 'int main()':
0_0_32260020_29072.cpp:6:12: error: 'cin' was not declared in this scope
      while(cin>>n>>m>>k){
            ^
0_0_32260020_29072.cpp:8:16: error: 'init' was not declared in this scope
           init() ;
                ^
0_0_32260020_29072.cpp:9:11: error: 'sourse' was not declared in this scope
           sourse = 0 , meet = n*m + 1 ;
           ^
0_0_32260020_29072.cpp:9:24: error: 'meet' was not declared in this scope
           sourse = 0 , meet = n*m + 1 ;
                        ^
0_0_32260020_29072.cpp:12:38: error: 'scanf' was not declared in this scope
                  scanf("%d" ,&w[i][j]) ;
                                      ^
0_0_32260020_29072.cpp:16:37: error: 'memset' was not declared in this scope
           memset(is , 0 , sizeof(is)) ;
                                     ^
0_0_32260020_29072.cpp:18:36: error: 'scanf' was not declared in this scope
                scanf("%d%d" ,&i ,&j) ;
                                    ^
0_0_32260020_29072.cpp:26:42: error: 'inf' was not declared in this scope
                           add(u , meet , inf) ;
                                          ^
0_0_32260020_29072.cpp:26:45: error: 'add' was not declared in this scope
                           add(u , meet , inf) ;
                                             ^
0_0_32260020_29072.cpp:28:49: error: 'add' was not declared in this scope
                           add(u , meet , w[i][j]) ;
                                                 ^
0_0_32260020_29072.cpp:32:43: error: 'inf' was not declared in this scope
                          add(sourse , u , inf) ;
                                           ^
0_0_32260020_29072.cpp:32:46: error: 'add' was not declared in this scope
                          add(sourse , u , inf) ;
                                              ^
0_0_32260020_29072.cpp:34:50: error: 'add' was not declared in this scope
                          add(sourse , u , w[i][j]) ;
                                                  ^
0_0_32260020_29072.cpp:36:61: error: 'add' was not declared in this scope
                          add(u , u-m , 2*(w[i][j]&w[i-1][j])) ;
                                                             ^
0_0_32260020_29072.cpp:38:61: error: 'add' was not declared in this scope
                          add(u , u+m , 2*(w[i][j]&w[i+1][j])) ;
                                                             ^
0_0_32260020_29072.cpp:40:61: error: 'add' was not declared in this scope
                          add(u , u-1 , 2*(w[i][j]&w[i][j-1])) ;
                                                             ^
0_0_32260020_29072.cpp:42:61: error: 'add' was not declared in this scope
                          add(u , u+1 , 2*(w[i][j]&w[i][j+1])) ;
                                                             ^
0_0_32260020_29072.cpp:46:41: error: 'maxflow' was not declared in this scope
           printf("%d\n" , sum - maxflow()) ;
                                         ^
0_0_32260020_29072.cpp:46:42: error: 'printf' was not declared in this scope
           printf("%d\n" , sum - maxflow()) ;
                                          ^


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