Compilare: main.cpp: In function 'bool valid(int, int)': main.cpp:20:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] return ((i >= 0) && (i < n) && (j >= 0) && (j < n) && (parc[i][j] != -1)); ~~^~~ main.cpp:20:51: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] return ((i >= 0) && (i < n) && (j >= 0) && (j < n) && (parc[i][j] != -1)); ~~^~~ main.cpp: In function 'int ct(pos, pos)': main.cpp:34:44: warning: array subscript has type 'char' [-Wchar-subscripts] if(valid(q.front().row + rmov[i], q.front().col + cmov[i])){ ^ main.cpp:34:69: warning: array subscript has type 'char' [-Wchar-subscripts] if(valid(q.front().row + rmov[i], q.front().col + cmov[i])){ ^ main.cpp:35:47: warning: array subscript has type 'char' [-Wchar-subscripts] q.push({q.front().row + rmov[i], q.front().col + cmov[i], q.front().dct + 1}); ^ main.cpp:35:72: warning: array subscript has type 'char' [-Wchar-subscripts] q.push({q.front().row + rmov[i], q.front().col + cmov[i], q.front().dct + 1}); ^ main.cpp:40:1: warning: control reaches end of non-void function [-Wreturn-type] } ^