View Compilation Error

0_0_36391859_23281.cpp: In function 'int main()':
0_0_36391859_23281.cpp:39:53: error: 'p' was not declared in this scope
    if(st.find({x - 1, y - 1}) != st.end()) merge(id[p], id[{x - 1, y - 1}]);
                                                     ^
0_0_36391859_23281.cpp:40:49: error: 'p' was not declared in this scope
    if(st.find({x - 1, y}) != st.end()) merge(id[p], id[{x - 1, y}]);
                                                 ^
0_0_36391859_23281.cpp:41:53: error: 'p' was not declared in this scope
    if(st.find({x - 1, y + 1}) != st.end()) merge(id[p], id[{x - 1, y + 1}]);
                                                     ^
0_0_36391859_23281.cpp:42:49: error: 'p' was not declared in this scope
    if(st.find({x, y - 1}) != st.end()) merge(id[p], id[{x, y - 1}]);
                                                 ^