Compilare: main.cpp: In function 'void prim()': main.cpp:60:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<val>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 60 | for (int i = 0; i < graf[prec].size(); i++) | ~~^~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:94:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<val>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 94 | for (int j = 0; j < graf[x].size(); j++) { | ~~^~~~~~~~~~~~~~~~ main.cpp:108:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<val>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 108 | for (int j = 0; j < graf[y].size(); j++) { | ~~^~~~~~~~~~~~~~~~