Compilare: main.cpp: In function 'void SPFA(int)': main.cpp:36:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 36 | for (int i = 0; i < G[u].size(); ++ i) { | ~~^~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:89:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 89 | for (int i = 0; i < v.size(); ++ i) | ~~^~~~~~~~~~