Compilare: user.cpp: In function ‘void dijkstraGR(int)’: user.cpp:39:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < gr[nod].size (); ++i) ^ user.cpp: In function ‘void bfs()’: user.cpp:64:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < v[nod].size (); ++i) ^ user.cpp: In function ‘bool dijkstra()’: user.cpp:92:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < v[nod.x].size (); ++i) ^ user.cpp: In function ‘int main()’: user.cpp:128:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < gr[nod].size (); ++i) ^ user.cpp:115:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("atac2.in", "r", stdin); ^ user.cpp:116:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("atac2.out", "w", stdout); ^ user.cpp:119:41: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d%d%d%d", &n, &m, &u, &nod); ^ user.cpp:121:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d", &start[i]); ^ user.cpp:124:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d%d", &x, &y); ^