Compilare: main.cpp: In function 'int dijkstra()': main.cpp:58:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0 ; i < G[u].size() ; i ++) ~~^~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:143:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("adapost.in" , "r" , stdin); ^ main.cpp:144:42: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("adapost.out" , "w" , stdout); ^ main.cpp:147:21: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d" , &n); ^ main.cpp:150:34: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%lf%lf" , &x , &y); ^ main.cpp: In function 'void bs()': main.cpp:139:11: warning: 'last' may be used uninitialized in this function [-Wmaybe-uninitialized] printf("%.5lf %.5lf\n" , mch[last] , sumdist); ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~