Compilare: main.cpp: In function 'int main()': main.cpp:10:19: warning: suggest parentheses around '-' inside '<<' [-Wparentheses] #define INF 1<<31 - 1 ~~~^~~ main.cpp:112:18: note: in expansion of macro 'INF' distances[i] = INF; ^~~ main.cpp:121:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<arcs[a].size(); ++i) ~^~~~~~~~~~~~~~~ main.cpp:10:19: warning: suggest parentheses around '-' inside '<<' [-Wparentheses] #define INF 1<<31 - 1 ~~~^~~ main.cpp:135:29: note: in expansion of macro 'INF' if (distances[i] == INF) ^~~ main.cpp:97:36: 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:98:38: 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:102:23: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ main.cpp:107:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &a, &b, &c); ^