Compilare: main.cpp: In function 'void Dijkstra(int)': main.cpp:5:17: warning: suggest parentheses around '-' inside '<<' [-Wparentheses] #define oo 1<<31-1 ~~^~ main.cpp:18:31: note: in expansion of macro 'oo' for (i=1; i<=n; i++) d[i]=oo; ^~ main.cpp: In function 'int main()': main.cpp:5:17: warning: suggest parentheses around '-' inside '<<' [-Wparentheses] #define oo 1<<31-1 ~~^~ main.cpp:55:22: note: in expansion of macro 'oo' if ( d[i] != oo )printf ("%d ", d[i]); ^~ main.cpp:42:40: 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); ^ main.cpp:43:42: 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); ^ main.cpp:45:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf ("%d%d", &n, &m ); ^ main.cpp:48:36: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &x, &y, &c); ^