Compilare: main.cpp: In function 'void dijkstra(int)': main.cpp:30:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<g[u.x].size(); i++) ~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:43:30: warning: unused variable 'll' [-Wunused-variable] int m,k,i,x,y,z,minn,j,l,ll; ^~ main.cpp:41:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] { freopen("ubuntzei.in", "r",stdin); ^ main.cpp:42:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("ubuntzei.out", "w",stdout); ^ main.cpp:44:32: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &n, &m, &k); ^ main.cpp:46:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &x); ^ main.cpp:52:36: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &x, &y, &z); ^