Compilare: main.cpp: In function 'int main()': main.cpp:61:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int w=0;w<sss[i].size();w++) ~^~~~~~~~~~~~~~ main.cpp:16:33: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("blis.in","r",stdin); ^ main.cpp:17:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("blis.out","w",stdout); ^ main.cpp:18:25: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n%s",&n,s); ^