View Compilation Error

0_0_26576354_3660.cpp:1:15: error: 'string' was not declared in this scope
 int get_score(string& s1,string& s2)//将s1连到s2后面所能得到的分数
               ^
0_0_26576354_3660.cpp:1:23: error: 's1' was not declared in this scope
 int get_score(string& s1,string& s2)//将s1连到s2后面所能得到的分数
                       ^
0_0_26576354_3660.cpp:1:26: error: 'string' was not declared in this scope
 int get_score(string& s1,string& s2)//将s1连到s2后面所能得到的分数
                          ^
0_0_26576354_3660.cpp:1:34: error: 's2' was not declared in this scope
 int get_score(string& s1,string& s2)//将s1连到s2后面所能得到的分数
                                  ^
0_0_26576354_3660.cpp:1:36: error: expression list treated as compound expression in initializer [-fpermissive]
 int get_score(string& s1,string& s2)//将s1连到s2后面所能得到的分数
                                    ^
0_0_26576354_3660.cpp:2:1: error: expected ',' or ';' before '{' token
 {
 ^