Compilare: main.cpp: In function 'void dijkstra(int, int)': main.cpp:38:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 38 | for(int i=0; i<city.size(); i++) | ~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:93:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 93 | for(int i=0; i<city.size(); i++) | ~^~~~~~~~~~~~ main.cpp:92:22: warning: iteration 17 invokes undefined behavior [-Waggressive-loop-optimizations] 92 | v1[i][j] = 0; | ~~~~~~~~~^~~ main.cpp:91:23: note: within this loop 91 | for(int j=0; j<=17; j++) | ~^~~~