Compilare: user.cpp: In function ‘void dijkstra(int, int)’: user.cpp:32:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < v[start].size(); i++) ^ user.cpp:46:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < v[a].size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:101:37: warning: suggest parentheses around ‘+’ inside ‘<<’ [-Wparentheses] sol = min(sol, mat[i][BIT(k + 1) - 1] + dist[i][n - 1]); ^ user.cpp:7:21: note: in definition of macro ‘min’ #define min(x,y) (x<y?x:y) ^ user.cpp:101:31: note: in expansion of macro ‘BIT’ sol = min(sol, mat[i][BIT(k + 1) - 1] + dist[i][n - 1]); ^ user.cpp:101:37: warning: suggest parentheses around ‘+’ inside ‘<<’ [-Wparentheses] sol = min(sol, mat[i][BIT(k + 1) - 1] + dist[i][n - 1]); ^ user.cpp:7:25: note: in definition of macro ‘min’ #define min(x,y) (x<y?x:y) ^ user.cpp:101:31: note: in expansion of macro ‘BIT’ sol = min(sol, mat[i][BIT(k + 1) - 1] + dist[i][n - 1]); ^ user.cpp:61:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ubuntzei.in", "r", stdin); ^ user.cpp:62:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ubuntzei.out", "w", stdout); ^ user.cpp:63:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &n, &m, &k); ^ user.cpp:67:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &vk[i]); ^ user.cpp:72:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &a, &b, &c); ^