View Compilation Error

0_0_11093345_11771.cpp: In function `int bfs()':
0_0_11093345_11771.cpp:42: error: expected primary-expression before '<' token
0_0_11093345_11771.cpp:42: error: `span' undeclared (first use this function)
0_0_11093345_11771.cpp:42: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_11093345_11771.cpp:42: error: expected `)' before "style"
0_0_11093345_11771.cpp:42: error: expected primary-expression at end of input
0_0_11093345_11771.cpp:42: error: expected `;' at end of input
0_0_11093345_11771.cpp:42: error: expected `}' at end of input
0_0_11093345_11771.cpp:42: error: expected `}' at end of input