Compilare: user.cpp: In function ‘void dijkstra(int, int)’: user.cpp:97:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < v[x].size(); ++i) { ^ user.cpp:79:6: warning: unused variable ‘x’ [-Wunused-variable] int x,i,y,c; ^ user.cpp: In function ‘int main()’: user.cpp:36:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &n, &m, &k); ^ user.cpp:43:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &x, &y, &c); ^