Compilare: main.cpp: In function 'int main()': main.cpp:47:11: warning: suggest parentheses around '+' inside '>>' [-Wparentheses] cin >> s+1; ~^~ main.cpp:44:31: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("div4.in","r",stdin); ^ main.cpp:45:33: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("div4.out","w",stdout); ^