Compilare: user.cpp: In function ‘int main()’: user.cpp:37:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0; j<dist[i].size(); j++) ^ user.cpp:45:27: warning: array subscript has type ‘char’ [-Wchar-subscripts] elim[pos[i][j]]=true; ^ user.cpp:58:15: warning: array subscript has type ‘char’ [-Wchar-subscripts] pos[s[i]].push_back(i); ^ user.cpp:68:19: warning: array subscript has type ‘char’ [-Wchar-subscripts] pos[s[j]].pop_back(); ^ user.cpp:72:21: warning: array subscript has type ‘char’ [-Wchar-subscripts] pos[s[j]].push_back(j); ^ user.cpp:21:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("bignumber.in", "r", stdin); ^ user.cpp:22:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("bignumber.out", "w", stdout); ^ user.cpp:23:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d\n", &N, &X); ^ user.cpp:24:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s\n", s+1); ^