matrice4.cpp:4: error: 'mt19937_64' does not name a type matrice4.cpp: In function 'long long int val(bool)': matrice4.cpp:7: error: 'rnd' was not declared in this scope matrice4.cpp: In function 'int bruteforce()': matrice4.cpp:31: warning: no return statement in function returning non-void matrice4.cpp: In function 'int efficient()': matrice4.cpp:37: warning: no return statement in function returning non-void matrice4.cpp: In function 'int main()': matrice4.cpp:48: error: 'random_device' is not a member of 'std' matrice4.cpp:48: error: expected ',' or ';' before '{' token matrice4.cpp:48: error: expected primary-expression before ')' token matrice4.cpp:49: error: 'rnd' was not declared in this scope