Compilare: main.cpp: In function 'int main()': main.cpp:50:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j= 0; j<graph[xmin].size(); j++) ~^~~~~~~~~~~~~~~~~~~ main.cpp:33:17: warning: unused variable 'd' [-Wunused-variable] int N,M,x,y,d,c; ^ main.cpp: In function 'int min_dist(int*, int, int*)': main.cpp:26:12: warning: 'ii' may be used uninitialized in this function [-Wmaybe-uninitialized] return ii; ^~ main.cpp: In function 'int main()': main.cpp:49:18: warning: 'ii' may be used uninitialized in this function [-Wmaybe-uninitialized] viz[xmin]=1; ~~~~~~~~~^~