Compilare: main.cpp: In function 'bool cuplaj_dfs(int, int)': main.cpp:17:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k = 0; k < g[from].size(); k ++) { ~~^~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:119:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(v.size() == n * 2) { ~~~~~~~~~^~~~~~~~ main.cpp:120:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v.size(); i ++) { ~~^~~~~~~~~~ main.cpp:57:38: 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:58:40: 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:61:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &t); ^ main.cpp:65:24: 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:76:34: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^