Compilare: user.cpp: In function ‘int main()’: user.cpp:123:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < c.size(); i++) { ^ user.cpp:132:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i < c.size() - 1) o << 'R' << ' '; ^ user.cpp:106:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("tester.in", "r", stdin); ^ user.cpp:107:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("tester.out", "w", stdout); ^ user.cpp:110:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &n, &m); ^ user.cpp:113:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &u, &v); ^