Compilare: user.cpp: In function ‘int ind_min(int)’: user.cpp:21:11: warning: suggest parentheses around ‘+’ inside ‘<<’ [-Wparentheses] if(nod<<1 +1 <=heap[0]) ^ user.cpp:22:44: warning: suggest parentheses around ‘+’ inside ‘<<’ [-Wparentheses] return ((d[heap[nod<<1]]<d[heap[nod<<1 +1]])?(nod<<1):(2*nod+1)); ^ user.cpp: In function ‘int main()’: user.cpp:83:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dijkstra.in","r",stdin); ^ user.cpp:84:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dijkstra.out","w",stdout); ^ user.cpp:85:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d\n",&n,&m); ^ user.cpp:88:35: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d\n",&x,&y,&z); ^