Compilare: main.cpp: In function 'void dijkstra()': main.cpp:58:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v[node].size(); ++i) ~^~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:84:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("dragoni.in", "r", stdin); ^ main.cpp:85:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("dragoni.out", "w", stdout); ^ main.cpp:87:22: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &cer); ^ main.cpp:88:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ main.cpp:90:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &dmax[i]); ^ main.cpp:93:45: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &a[i], &b[i], &d[i]); ^