Compilare: user.cpp: In function ‘int main()’: user.cpp:120:15: warning: statement has no effect [-Wunused-value] act.s == 0; ^ user.cpp:88:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("spirt.in","r",stdin); ^ user.cpp:89:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("spirt.out","w",stdout); ^ user.cpp:91:41: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld%lld\n%s", &n, &m, s + 1); ^