Eroare de compilare: user.cpp:8:1: error: ‘ifstream’ does not name a type ifstream cin("ratway.in"); ^~~~~~~~ user.cpp:9:1: error: ‘ofstream’ does not name a type ofstream cout("ratway.out"); ^~~~~~~~ user.cpp:21:1: error: ‘stack’ does not name a type stack <int> S; ^~~~~ user.cpp:25:6: warning: ISO C++ forbids declaration of ‘main’ with no type [-Wreturn-type] main() ^ user.cpp: In function ‘int main()’: user.cpp:28:2: error: ‘cin’ was not declared in this scope cin >> n >> m; ^~~ user.cpp:42:5: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(grad[i]) ^ user.cpp:57:2: error: ‘S’ was not declared in this scope S.push(1); ^ user.cpp:78:2: error: ‘cout’ was not declared in this scope cout << m << '\n'; ^~~~ user.cpp:80:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < ans.size() - 1; i++) ~~^~~~~~~~~~~~~~~~