View Compilation Error

193981_0_4704.cpp: In function `int main(int, char**)':
193981_0_4704.cpp:12: error: `vector' undeclared (first use this function)
193981_0_4704.cpp:12: error: (Each undeclared identifier is reported only once for each function it appears in.)
193981_0_4704.cpp:12: error: expected primary-expression before '>' token
193981_0_4704.cpp:12: error: `b' undeclared (first use this function)