Compilare: user.cpp: In function ‘void pre_dfs(int)’: user.cpp:48:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < v[nod].size(); ++i) ^ user.cpp: In function ‘void dfs(int, int)’: user.cpp:55:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < v[nod].size(); ++i) ^ user.cpp: In function ‘int main()’: user.cpp:86:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < v[stea].size(); ++i) ^ user.cpp:60:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cercetatori.in", "r", stdin); ^ user.cpp:61:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cercetatori.out", "w", stdout); ^ user.cpp:66:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &q); ^ user.cpp:68:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &nod, &tata); ^ user.cpp:69:54: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lf%lf", &initial[nod].x, &initial[nod].y); ^ user.cpp:91:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &nod, &timp); ^ user.cpp:93:91: warning: ‘stea’ may be used uninitialized in this function [-Wmaybe-uninitialized] printf("%.6f %.6f\n", ceva[stea].x + poz[timp][nod].x, ceva[stea].y + poz[timp][nod].y); ^