View Compilation Error

0_0_38206157_5807.cpp: In function 'void guass()':
0_0_38206157_5807.cpp:70:12: error: expected unqualified-id before '[' token
  for(auto &[x,y]:ans){
            ^
0_0_38206157_5807.cpp:70:12: error: expected ';' before '[' token
0_0_38206157_5807.cpp:70:13: error: 'x' was not declared in this scope
  for(auto &[x,y]:ans){
             ^
0_0_38206157_5807.cpp:70:15: error: 'y' was not declared in this scope
  for(auto &[x,y]:ans){
               ^
0_0_38206157_5807.cpp: In lambda function:
0_0_38206157_5807.cpp:70:17: error: expected '{' before ':' token
  for(auto &[x,y]:ans){
                 ^
0_0_38206157_5807.cpp: In function 'void guass()':
0_0_38206157_5807.cpp:70:17: error: expected ';' before ':' token
0_0_38206157_5807.cpp:70:17: error: expected primary-expression before ':' token
0_0_38206157_5807.cpp:70:17: error: expected ')' before ':' token
0_0_38206157_5807.cpp:70:17: error: expected primary-expression before ':' token