Compilare: main.cpp: In function 'void cpy()': main.cpp:15:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<ans.size(); i++) ~^~~~~~~~~~~ main.cpp: In function 'void dfs(int, int, int)': main.cpp:21:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<g[nod].size(); i++) ~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:62:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(ans.size()<=k){ ~~~~~~~~~~^~~ main.cpp:71:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<sol.size(); i++) ~^~~~~~~~~~~ main.cpp:73:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1; i<=n && sol.size()<k; i++) ~~~~~~~~~~^~ main.cpp:77:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<sol.size(); i++) ~^~~~~~~~~~~ main.cpp:47:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] { freopen("salvare.in", "r",stdin); ^ main.cpp:48:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("salvare.out", "w",stdout); ^ main.cpp:50:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &k); ^ main.cpp:52:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^