Compilare: user.cpp: In function ‘int solve()’: user.cpp:34:17: warning: suggest parentheses around comparison in operand of ‘==’ [-Wparentheses] if (top.first > 1 == !seen[top.first - 1][top.second] && !mat[top.first - 1][top.second]) { ^ user.cpp:43:17: warning: suggest parentheses around comparison in operand of ‘==’ [-Wparentheses] if (top.first < N == !seen[top.first + 1][top.second] && !mat[top.first + 1][top.second]) { ^ user.cpp:52:18: warning: suggest parentheses around comparison in operand of ‘==’ [-Wparentheses] if (top.second > 1 == !seen[top.first][top.second - 1] && !mat[top.first][top.second - 1]) { ^ user.cpp:61:18: warning: suggest parentheses around comparison in operand of ‘==’ [-Wparentheses] if (top.second < N == !seen[top.first][top.second + 1] && !mat[top.first][top.second + 1]) { ^ user.cpp:70:1: warning: control reaches end of non-void function [-Wreturn-type] } ^