Compilare: main.cpp: In function 'int c(int)': main.cpp:20:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (st==v[x].size()) ~~^~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:31:27: warning: format '%s' expects argument of type 'char*', but argument 2 has type 'char (*)[5004]' [-Wformat=] scanf ("%s", &s[i]); ^ main.cpp:27:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("search.in","r",stdin); ^ main.cpp:28:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("search.out","w",stdout); ^ main.cpp:29:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf ("%d %d", &n, &m); ^ main.cpp:31:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf ("%s", &s[i]); ^ main.cpp:35:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf ("%c", &ch); ^ main.cpp:36:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf ("%c", &a[i]); ^