Compilare: user.cpp: In function ‘int main()’: user.cpp:151:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < st.size(); ++i) ^ user.cpp:134:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] { freopen("game4.in", "r", stdin); ^ user.cpp:135:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("game4.out", "w", stdout); ^ user.cpp:137:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &t, &tip); ^ user.cpp:141:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] { scanf("%d", &n); ^ user.cpp:149:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &a[i]), go(a[i]); ^