Compilare: main.cpp: In function 'void dfs(int)': main.cpp:34:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<graph[node].size(); ++i) ~^~~~~~~~~~~~~~~~~~~ main.cpp:39:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<graph[node].size(); ++i) {graph[node][i]+=i; mx=max(mx, graph[node][i]);} ~^~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:16:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("zvon.in", "r", stdin); ^ main.cpp:17:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("zvon.out", "w", stdout); ^ main.cpp:18:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &t); ^ main.cpp:20:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ main.cpp:24:34: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^