Compilare: main.cpp:1:2: warning: #import is a deprecated GCC extension [-Wdeprecated] 1 | #import <fstream> | ^~~~~~ main.cpp:2:2: warning: #import is a deprecated GCC extension [-Wdeprecated] 2 | #import <cstring> | ^~~~~~ main.cpp:3:2: warning: #import is a deprecated GCC extension [-Wdeprecated] 3 | #import <vector> | ^~~~~~ main.cpp:4:2: warning: #import is a deprecated GCC extension [-Wdeprecated] 4 | #import<algorithm> | ^~~~~~ main.cpp: In function 'void backtrack()': main.cpp:65:20: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 65 | if(x.size()>nr) | ~~~~~~~~^~~