Compilare: user.cpp: In function ‘int main()’: user.cpp:49:22: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(!P[S[0]].empty()) { ^ user.cpp:50:23: warning: array subscript has type ‘char’ [-Wchar-subscripts] a = P[S[0]].top().first; ^ user.cpp:51:23: warning: array subscript has type ‘char’ [-Wchar-subscripts] b = P[S[0]].top().second; ^ user.cpp:53:23: warning: array subscript has type ‘char’ [-Wchar-subscripts] P[S[0]].pop(); ^ user.cpp:61:19: warning: array subscript has type ‘char’ [-Wchar-subscripts] P[S[l - 1]].push ^ user.cpp:38:43: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(inputFile.c_str(), "r", stdin); ^ user.cpp:39:45: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(outputFile.c_str(), "w", stdout); ^ user.cpp:42:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &N, &K); ^ user.cpp:45:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s", S); ^