Compilare: user.cpp: In member function ‘void Heap::downHeap(int)’: user.cpp:66:19: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(min2(v[p*2].c,v[p*2+1].c),v[p].c) ^ user.cpp: In function ‘void dijkstra(int)’: user.cpp:103:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<g[dad.v].size();i++){ ^ user.cpp: In function ‘int main()’: user.cpp:118:37: 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:119:39: 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:120:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:124:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&x,&y,&z); ^