Compilare: main.cpp: In function 'void dfs(int, int, int, int)': main.cpp:30:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0 ; j < T2[u].size() && !ok ; j ++) ~~^~~~~~~~~~~~~~ main.cpp:44:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0 ; j < T1[u].size() && !ok ; j ++) ~~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:60:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("dungeon.in", "r", stdin); ^ main.cpp:61:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("dungeon.out", "w", stdout); ^ main.cpp:63:22: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &tst); ^ main.cpp:66:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ main.cpp:69:34: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^ main.cpp:75:34: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^ main.cpp:81:34: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^