View Compilation Error

0_0_4706223_8320.cpp: In function `int Dijkstra(int, int)':
0_0_4706223_8320.cpp:5: error: `flag' undeclared (first use this function)
0_0_4706223_8320.cpp:5: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_4706223_8320.cpp:11: error: `road' undeclared (first use this function)
0_0_4706223_8320.cpp: In function `int main()':
0_0_4706223_8320.cpp:34: error: `T' undeclared (first use this function)
0_0_4706223_8320.cpp:34: error: `S' undeclared (first use this function)
0_0_4706223_8320.cpp:34: error: `D' undeclared (first use this function)
0_0_4706223_8320.cpp:34: error: `scanf' undeclared (first use this function)
0_0_4706223_8320.cpp:34: error: `EOF' undeclared (first use this function)
0_0_4706223_8320.cpp:38: error: `road' undeclared (first use this function)
0_0_4706223_8320.cpp:58: error: `printf' undeclared (first use this function)