Compilare: user.cpp: In function ‘int main()’: user.cpp:15:18: warning: format ‘%s’ expects argument of type ‘char*’, but argument 2 has type ‘char (*)[2000000]’ [-Wformat=] scanf("%s",&c); ^ user.cpp:16:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<strlen(c);++i)a.push_back(c[i]); ^ user.cpp:17:18: warning: format ‘%s’ expects argument of type ‘char*’, but argument 2 has type ‘char (*)[2000000]’ [-Wformat=] scanf("%s",&c); ^ user.cpp:18:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<strlen(c);++i)b.push_back(c[i]); ^ user.cpp:26:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<d.size();++i)printf("%d ",d[i]); ^ user.cpp:13:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("strmatch.in","r",stdin); ^ user.cpp:14:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("strmatch.out","w",stdout); ^ user.cpp:15:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s",&c); ^ user.cpp:17:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s",&c); ^