Compilare: user.cpp: In function ‘int main()’: user.cpp:41:15: warning: array subscript has type ‘char’ [-Wchar-subscripts] vf1[ch]++; ^ user.cpp:54:15: warning: array subscript has type ‘char’ [-Wchar-subscripts] vf2[ch]++; ^ user.cpp:58:13: warning: array subscript has type ‘char’ [-Wchar-subscripts] p[ch].push_back(n2); ^ user.cpp:76:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] poz=p[v1[i]][last[v1[i]]]; ^ user.cpp:76:32: warning: array subscript has type ‘char’ [-Wchar-subscripts] poz=p[v1[i]][last[v1[i]]]; ^ user.cpp:78:19: warning: array subscript has type ‘char’ [-Wchar-subscripts] last[v1[i]]++; ^ user.cpp:29:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen( "swap.in", "r", stdin ); ^ user.cpp:30:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen( "swap.out", "w", stdout ); ^