Compilare: main.cpp: In function 'void dfs(int)': main.cpp:38:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<edge>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 38 | for (int i = 0; i < adj[node].size(); ++i) | ~~^~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:76:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<edge>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 76 | for (i = 0; i < adj[x].size(); ++i) | ~~^~~~~~~~~~~~~~~ main.cpp:49:15: warning: unused variable 'j' [-Wunused-variable] 49 | int c, i, j, a, b, distanta; | ^ main.cpp:67:24: warning: iteration 804 invokes undefined behavior [-Waggressive-loop-optimizations] 67 | distmin[i] = INF; | ~~~~~~~~~~~^~~~~ main.cpp:66:23: note: within this loop 66 | for (i = 1; i <= NMAX; ++i) | ^