Compilare: main.cpp: In function 'void dfs(int, int)': main.cpp:34:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 34 | for(int len = 1; len < fii.size(); len++){ | ~~~~^~~~~~~~~~~~ main.cpp:35:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 35 | for(int i = 0; i < fii.size() - len; i++){ | ~~^~~~~~~~~~~~~~~~~~