Compilare: user.cpp: In function ‘int main()’: user.cpp:72:12: warning: array subscript has type ‘char’ [-Wchar-subscripts] mp[str[i]] = i; ^ user.cpp: In lambda function: user.cpp:95:26: warning: array subscript has type ‘char’ [-Wchar-subscripts] return mp[mx[a.x][a.y]] < mp[mx[b.x][b.y]]; }); ^ user.cpp:95:45: warning: array subscript has type ‘char’ [-Wchar-subscripts] return mp[mx[a.x][a.y]] < mp[mx[b.x][b.y]]; }); ^ user.cpp: In function ‘int main()’: user.cpp:66:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("miting.in", "r", stdin); ^ user.cpp:67:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("miting.out", "w", stdout); ^ user.cpp:69:40: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d %s ", &tsk, &n, &m, str); ^ user.cpp:75:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s ", mx[i]); ^