Compilare: user.cpp: In function ‘void djikstra(int)’: user.cpp:29:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<v[nd].size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:51:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(v[x].size()<=id[x]) ^ user.cpp:53:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(v[y].size()<=id[y]) ^ user.cpp:55:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(c[x].size()<=id[x]) ^ user.cpp:57:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(c[y].size()<=id[y]) ^ user.cpp:39:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("tempest.in", "r", stdin); ^ user.cpp:40:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("tempest.out", "w", stdout); ^ user.cpp:43:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &T); ^ user.cpp:46:42: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d", &n, &m, &S, &D); ^ user.cpp:50:43: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &x, &y, &ct); ^ user.cpp:67:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &k); ^ user.cpp:72:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &ind); ^