Compilare: main.cpp: In function 'void preCompute(int)': main.cpp:18:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < G[node].size(); ++i) ~~^~~~~~~~~~~~~~~~ main.cpp: In function 'void markDads(int, int)': main.cpp:33:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < G[node].size(); ++i) ~~^~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:59:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("petrica.in", "r", stdin); ^ main.cpp:60:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("petrica.out", "w", stdout); ^ main.cpp:64:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ main.cpp:67:31: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &value[i]); ^ main.cpp:72:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^