Compilare: main.cpp: In function 'void dijkstra()': main.cpp:31:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int f = 0 ; f < v[p].size() ; f ++) ~~^~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:44:35: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin , "%d%d" , &n , &m); ^ main.cpp:47:49: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin , "%d%d%d" , &x , &y , &cost); ^