Compilare: main.cpp: In function 'void bfs(int)': main.cpp:25:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<g[u.dist].size(); i++) ~^~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:49:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] { freopen("tairos.in", "r", stdin); ^ main.cpp:50:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("tairos.out", "w",stdout); ^ main.cpp:52:33: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &distanta); ^ main.cpp:54:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^