Compilare: main.cpp: In function 'int forma_poloneza()': main.cpp:14:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0 ; i < s.length() ; i ++) ~~^~~~~~~~~~~~ main.cpp:18:65: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if((i > 0 && !isalpha(s[i]) && isalpha(s[i - 1])) || (i == s.length() - 1 && isalpha(s[i]))) ~~^~~~~~~~~~~~~~~~~ main.cpp:11:25: warning: unused variable 'j' [-Wunused-variable] int i, top1, top2 , j; ^ main.cpp: In function 'int main()': main.cpp:89:16: warning: unused variable 'j' [-Wunused-variable] int n, i , j; ^ main.cpp:87:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("bool.in", "r", stdin); ^ main.cpp:88:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("bool.out", "w", stdout); ^ main.cpp:92:22: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n", &n); ^ main.cpp:95:25: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%c", &ch); ^