Compilare: main.cpp: In function 'void bfs()': main.cpp:72:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v[Nod].size(); ++i) ~~^~~~~~~~~~~~~~~ main.cpp:76:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < v[Nod2].size(); ++j) ~~^~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:86:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("pirati.in", "r", stdin); ^ main.cpp:87:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("pirati.out", "w", stdout); ^ main.cpp:88:36: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d\n", &n, &m, &Q); ^ main.cpp:92:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%c", &L); ^ main.cpp:89:5: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] for(int i = 1; i <= n; ++i, scanf("\n")) ^~~ main.cpp:122:49: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d", &x1, &y1, &x2, &y2); ^