Compilare: user.cpp: In function ‘void DFS(std::pair<int, int>)’: user.cpp:41:72: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] dirChanges[color] += (abs(painting[x - 1][y]) == color && abs(painting[x][y + 1]) == color || ^ user.cpp:43:72: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] abs(painting[x + 1][y]) == color && abs(painting[x][y + 1]) == color || ^ user.cpp:44:72: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] abs(painting[x + 1][y]) == color && abs(painting[x][y - 1]) == color); ^ user.cpp: In function ‘int main()’: user.cpp:52:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("pictura.in", "r", stdin); ^ user.cpp:53:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("pictura.out", "w", stdout); ^ user.cpp:55:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &N, &M); ^ user.cpp:61:41: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &painting[i][j]); ^