Compilare: main.cpp: In function 'bool verif(long long int, int, int)': main.cpp:22:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 22 | for (int i = 0; i < a.size(); i++) { | ~~^~~~~~~~~~ main.cpp:52:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 52 | if (i + 1 < a.size()) { | ~~~~~~^~~~~~~~~~