Mã chấm: 256957

Main.java:34: error: array required, but int found
                    u[u] += u[first[u]] + 1;
                     ^
Main.java:34: error: array required, but int found
                    u[u] += u[first[u]] + 1;
                             ^
Main.java:38: error: array required, but int found
                    u[u] = 0;
                     ^
Main.java:42: error: array required, but int found
                    u[v] += u[u] + 1;
                     ^
Main.java:42: error: array required, but int found
                    u[v] += u[u] + 1;
                             ^
Main.java:46: error: array required, but int found
                    u[v] = 0;
                     ^
6 errors