Compilare: main.cpp: In function 'bool checkMate(int (*)[9], const string&)': main.cpp:130:15: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses] if(board[conv.first][j] != 0) ^ main.cpp:137:15: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses] if(board[conv.first][j] != 0) ^ main.cpp:144:15: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses] if(board[i][conv.second] != 0) ^ main.cpp:150:15: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses] if(board[i][conv.second] != 0) ^ main.cpp:167:15: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses] if(board[i][j] != 0) ^ main.cpp:174:15: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses] if(board[i][j] != 0) ^ main.cpp:182:15: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses] if(board[i][j] != 0) ^ main.cpp:189:15: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses] if(board[i][j] != 0) ^ main.cpp: In function 'int quad(std::pair<int, int>)': main.cpp:87:1: warning: control reaches end of non-void function [-Wreturn-type] } ^