Compilare: main.cpp: In function 'int main()': main.cpp:88:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<punct>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 88 | for(int i = 0; i < st.size(); i++) s.insert( st[i] ); | ~~^~~~~~~~~~~ main.cpp:99:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<punct>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 99 | for(int i = 0; i < st.size(); i++){ | ~~^~~~~~~~~~~ main.cpp:103:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<punct>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 103 | if(i + 1 == st.size()) l[st[i].poz].next = st[0].poz; | ~~~~~~^~~~~~~~~~~~