Compilare: user.cpp: In function ‘int main()’: user.cpp:44:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < path.size(); ++i) ^ user.cpp:46:47: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = i; j < path.size() - 1; ++j) ^ user.cpp:15:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("zaharel.in", "r", stdin); ^ user.cpp:16:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("zaharel.out", "w", stdout); ^ user.cpp:19:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ user.cpp:23:41: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %c", &xx, &yy, &ch); ^