Compilare: main.cpp: In function 'bool check()': main.cpp:29:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 29 | for(int i=0;i<ctcsol.size();i++) | ~^~~~~~~~~~~~~~ main.cpp:32:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 32 | if(next==ctcsol.size()) | ~~~~^~~~~~~~~~~~~~~ main.cpp: In function 'void backtrack()': main.cpp:48:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 48 | for(int i=0;i<ctcsol.size()&&ok;i++) | ~^~~~~~~~~~~~~~ main.cpp:51:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 51 | if(next==ctcsol.size()) | ~~~~^~~~~~~~~~~~~~~