Compilare: user.cpp: In function ‘std::pair<int, int> centroid_decomp(int)’: user.cpp:75:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < G[c].size(); i++) { ^ user.cpp: In function ‘int main()’: user.cpp:84:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ecotraseu.in", "r", stdin); ^ user.cpp:85:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ecotraseu.out", "w", stdout); ^ user.cpp:86:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%i", &t); ^ user.cpp:91:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%i", &n); ^ user.cpp:98:40: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%i%i%i", &x, &y, &z); ^ user.cpp: In function ‘int find_centroid(int)’: user.cpp:39:17: warning: ‘x’ may be used uninitialized in this function [-Wmaybe-uninitialized] w[x] += w[s]; ^