Compilare: main.cpp: In function 'bool cuplaj(int)': main.cpp:16:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<l[n].size();i++) ~^~~~~~~~~~~~ main.cpp:24:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<l[n].size();i++) ~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:38:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("canibali.in","r",stdin); ^ main.cpp:39:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("canibali.out","w",stdout); ^