Compilare: user.cpp: In function ‘int main()’: user.cpp:247:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("game2d.in","r",stdin); ^ user.cpp:248:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("game2d.out","w",stdout); ^ user.cpp:250:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:251:60: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d",&start.x,&start.y,&finish.x,&finish.y); ^ user.cpp:253:132: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d",&rectangle[i].upperLeft.x,&rectangle[i].upperLeft.y,&rectangle[i].lowerRight.x,&rectangle[i].lowerRight.y); ^ user.cpp: In function ‘void Dijsktra()’: user.cpp:227:21: warning: array subscript is below array bounds [-Warray-bounds] best[nodeCount-1]=0; ^ user.cpp:239:58: warning: ‘node’ may be used uninitialized in this function [-Wmaybe-uninitialized] best[neighbour]=min(best[neighbour],best[node]+bestCost); ^